Three differences stand out against an otherwise well-matched feature set. The most practically significant is NFC: the Oppo A6 Max has it, the Realme 15T 5G does not. NFC enables contactless payments, quick Bluetooth pairing, and transit card functionality — for many users it has quietly become an everyday essential, and its absence on the Realme is a genuine capability gap rather than a niche omission. Alongside this, the A6 Max also leads on cellular download speed, rated at 5000 Mbits/s versus the Realme's 3300 Mbits/s — a difference that matters most in congested networks or when pulling down large files, where the higher headroom translates to faster real-world throughput.
The Realme 15T 5G answers back with one exclusive advantage: an external memory slot. Since both phones ship with 256GB of internal storage, expandable memory is not a necessity for most users — but for those who store large video libraries, offline maps, or media collections, the option to add a microSD card is a meaningful flexibility the Oppo cannot offer at any price.
Taken together, the Oppo A6 Max holds the stronger position in this category. NFC and superior download speeds are broadly useful features that affect daily routines, while expandable storage appeals to a narrower audience with specific needs. Users who rely on mobile payments or frequently operate on fast cellular networks will find the A6 Max considerably better equipped, making it the clear winner here.