Samsung Galaxy S25 Ultra 256GB VS Ulefone Note 21

The most consequential difference in this group is water resistance: the Samsung Galaxy S25 Ultra is rated as waterproof, while the Ulefone Note 21 offers no such protection at all. In practical terms, this means the S25 Ultra can survive rain, splashes, or accidental submersion, while the Note 21 is vulnerable to any liquid contact — a significant consideration for everyday durability.

When it comes to form factor, the picture is more nuanced. The Note 21 is notably lighter at 196.1 g versus the S25 Ultra's 218 g, which translates to a more comfortable feel during extended one-handed use. However, the S25 Ultra is considerably slimmer at 8.2 mm thick compared to the Note 21's 9.2 mm, and its overall displaced volume (103.6 cm³ vs 112.8 cm³) shows it is the more compact and pocketable device despite being heavier — the extra weight likely coming from premium internal components and materials rather than sheer bulk.

Overall, the Samsung Galaxy S25 Ultra holds a clear edge in this design group. Its waterproofing is a meaningful real-world advantage the Note 21 simply cannot match, and its slimmer, lower-volume chassis makes it the more refined and protective physical package — even if you do give up a few grams in hand weight.

At the heart of this group is a fundamental technology divide: the S25 Ultra uses an OLED/AMOLED panel, while the Ulefone Note 21 relies on an LCD IPS screen. AMOLED displays produce true blacks by switching off individual pixels, delivering vastly superior contrast and color vibrancy compared to LCD, which always requires a backlight. For media consumption, dark-mode apps, or anything visually demanding, this distinction alone makes a decisive difference in day-to-day experience.

The gap widens further when examining raw visual fidelity. The S25 Ultra's 498 ppi pixel density at a 1440 x 3120 resolution on a 6.9″ screen produces sharp, detailed imagery where individual pixels are essentially invisible. The Note 21's 269 ppi at 720 x 1612 is serviceable for basic use but noticeably softer — text edges and fine image details will appear less crisp, particularly on its 6.56″ panel. The S25 Ultra also pulls ahead with HDR10+ support and Always-On Display, enabling richer highlights and shadows in compatible content and at-a-glance notifications without fully waking the screen — features the Note 21 lacks entirely.

Across every measurable display metric, the Samsung Galaxy S25 Ultra holds an overwhelming advantage. Its higher refresh rate (120Hz vs 90Hz), damage-resistant glass, superior panel technology, and HDR support combine into a screen experience in an entirely different class from the Note 21, which suits only light, everyday tasks where display quality is not a priority.

Few comparisons in this category are this one-sided. The S25 Ultra's Qualcomm Snapdragon 8 Elite, built on a cutting-edge 3 nm process, posts an AnTuTu score of 2,207,809 — roughly 8.8 times higher than the Ulefone Note 21's 251,000 on its Unisoc T606 at 12 nm. This generational gap in semiconductor fabrication is not merely a numbers game: a smaller process node means more transistors per mm², translating directly into greater computational throughput and meaningfully better power efficiency per task completed.

The raw CPU and GPU numbers reinforce just how wide this chasm is. The S25 Ultra's Geekbench 6 multi-core score of 9,846 dwarfs the Note 21's 1,391, and its Adreno 830 GPU — clocked at 1200 MHz with 1,536 shading units — operates in an entirely different league from the Note 21's Mali G57 MP1 at 650 MHz with just 64 shading units. In practice, this means the S25 Ultra handles demanding games, video editing, and heavy multitasking with ease, while the Note 21 is suited primarily to basic tasks like browsing, messaging, and light media playback. The memory architecture tells a similar story: 12 GB of DDR5 RAM at 5,300 MHz versus 4 GB of DDR4 at 1,600 MHz means the S25 Ultra can keep far more apps active simultaneously and feeds its CPU/GPU with data at a dramatically faster rate.

The Samsung Galaxy S25 Ultra wins this group by an extraordinary margin. There is virtually no performance metric in which the Note 21 is competitive — the Note 21 is a device for essential everyday use, while the S25 Ultra is built for users who demand top-tier processing power across every workload.

The camera hardware gap here is substantial. The S25 Ultra fields a quad-lens rear system headlined by a 200 MP main sensor, complemented by two additional 50 MP lenses and a 10 MP shooter, while the Ulefone Note 21 relies on a single 13 MP main camera. Beyond raw megapixels, the S25 Ultra adds a BSI sensor — which captures more light by placing circuitry behind the photodiode layer — and optical image stabilization (OIS), both of which dramatically improve low-light and motion photography. The Note 21 has neither. The S25 Ultra also offers 5x optical zoom, meaning it can magnify distant subjects without any loss of image quality; the Note 21 has no optical zoom at all.

Video recording tells an equally decisive story. The S25 Ultra shoots up to 4320p (8K) at 30 fps with HDR10 support, whereas the Note 21 tops out at 1080p at 30 fps with no HDR recording. For anyone who records video seriously — whether for social content, travel, or archiving memories — this is a meaningful ceiling difference. On the control side, the S25 Ultra additionally supports manual shutter speed and RAW shooting, giving photographers the flexibility to post-process images with full data intact, capabilities the Note 21 does not offer.

The Samsung Galaxy S25 Ultra is the clear and commanding winner in this group. Its multi-lens system, sensor quality, optical zoom, stabilization, and video ceiling outclass the Note 21 across every dimension that matters to camera-focused users. The Note 21's camera is adequate for casual snapshots in good light, but it cannot compete in any meaningful photographic scenario where conditions or subject matter demand more.

Both devices run Android and share a broad common foundation — dark mode, dynamic theming, split-screen, widgets, offline voice recognition, and robust privacy controls like camera/microphone permissions and app tracking blockers are all present on each. For the majority of everyday software tasks, users on either device will find a familiar, capable Android experience. That said, the S25 Ultra ships on Android 15 while the Note 21 runs Android 14, meaning the S25 Ultra has access to the latest platform features and security patches out of the box.

Where the S25 Ultra meaningfully pulls ahead is in a cluster of productivity and power-user features. It supports desktop/PC mode, allowing the phone to function as a computer when connected to a display — a capability the Note 21 lacks entirely. It also includes focus modes for managing distractions, cross-site tracking blocking for stronger browser-level privacy, Wi-Fi password sharing for convenient network handoffs, and the ability to offload apps to reclaim storage without losing data. None of these are available on the Note 21. Individually each is a minor convenience; together they represent a noticeably more polished and feature-complete software environment.

The Samsung Galaxy S25 Ultra holds a clear edge in this group. While the shared feature set is extensive, the S25 Ultra's newer OS version and exclusive additions — particularly desktop mode and the stronger privacy controls — make it the more capable and future-ready software platform of the two.

Both phones carry an identical 5000 mAh battery, so on paper they start from the same energy reserve. In practice, actual longevity will differ based on how efficiently each device's hardware draws on that capacity — but within this group's data alone, capacity is a wash.

Charging is where the two diverge. The S25 Ultra supports 45W wired fast charging alongside wireless charging, while the Note 21 is capped at 10W and offers no wireless option. A 45W charger can replenish a 5000 mAh battery in roughly an hour or less under ideal conditions; at 10W, that process stretches to several hours. For users who need a quick top-up before heading out, this difference is genuinely impactful day-to-day. The addition of wireless charging on the S25 Ultra adds further flexibility — the ability to charge by simply setting the phone down on a pad is a convenience the Note 21 cannot replicate. One point in the Note 21's favor: it includes a charger in the box, whereas the S25 Ultra does not, meaning S25 Ultra buyers may need to purchase a compatible fast charger separately to realize its full charging potential.

The Samsung Galaxy S25 Ultra takes the edge in this group. Equal battery capacity means neither device has an inherent longevity advantage here, but the S25 Ultra's dramatically faster wired charging and added wireless charging capability give it meaningfully greater real-world convenience — provided the user sources an appropriate charger.

This group presents an interesting trade-off rather than a straightforward sweep. The S25 Ultra drops the 3.5 mm headphone jack entirely, committing users to wireless or USB-C audio, while the Ulefone Note 21 retains it — a genuine practical advantage for anyone with a collection of wired headphones or who listens in situations where Bluetooth connectivity is inconvenient or unavailable.

However, the S25 Ultra compensates with a considerably stronger wireless audio profile. It supports LDAC, aptX, and aptX HD — high-resolution Bluetooth codecs that transmit significantly more audio data than standard SBC or AAC, resulting in noticeably better sound quality when paired with compatible wireless headphones. The Note 21 supports none of these codecs, meaning Bluetooth audio on it is limited to lower-fidelity transmission regardless of headphone quality. The S25 Ultra also features stereo speakers, which produce a wider, more immersive soundstage for media consumption without headphones — the Note 21 is limited to a single speaker, a meaningful disadvantage for video watching or hands-free listening.

The Samsung Galaxy S25 Ultra holds the edge here for most users. The loss of a headphone jack is a real concession, and the Note 21's retention of one will matter to a specific audience. But the S25 Ultra's stereo speakers and high-resolution wireless codec support make it the stronger audio platform overall, particularly for those already invested in quality wireless headphones.

Wireless connectivity is one of the starkest divides in this group. The S25 Ultra supports 5G and tops out at Wi-Fi 7 with theoretical download speeds of 10,000 Mbits/s, while the Note 21 is capped at 4G LTE and Wi-Fi 5, maxing out at 300 Mbits/s down. In everyday terms, this means the S25 Ultra is positioned to take full advantage of next-generation mobile and home networks, both now and as infrastructure continues to roll out — the Note 21 is already behind the curve on cellular, and its Wi-Fi ceiling will become a bottleneck as routers advance. The S25 Ultra also runs Bluetooth 5.4 versus the Note 21's 5.0, offering incremental improvements in connection stability and efficiency.

Beyond raw radio specs, the S25 Ultra brings a considerably richer feature set. It includes NFC — essential for contactless payments and quick device pairing — which the Note 21 omits entirely. It packs a gyroscope and barometer for motion-based apps and weather/altitude sensing, neither of which the Note 21 has. The S25 Ultra also supports ANT+ for fitness device connectivity, ships with a stylus, and supports eSIM alongside its dual physical SIM slots. The Note 21 counters with one notable exclusive: a microSD card slot for expandable storage, which the S25 Ultra lacks.

The Samsung Galaxy S25 Ultra dominates this group across nearly every dimension. The Note 21's expandable storage slot is a practical advantage for storage-conscious users, but it cannot offset the S25 Ultra's comprehensive lead in cellular generation, Wi-Fi capability, NFC, sensors, and stylus support — making it the far more connected and feature-complete device.

Within the scope of this specification group, the Samsung Galaxy S25 Ultra 256GB and the Ulefone Note 21 are in complete agreement: both have a video light, neither uses sapphire glass, and neither features a curved or e-paper display. There is no differentiator to analyze here.

This is a straightforward tie — the provided specs offer no basis for awarding either device an advantage in this category.