The most significant differentiator in this group is water protection. The Realme P3 Pro carries an IP68 rating, meaning it is fully waterproof and can withstand submersion in water — a meaningful advantage for users who swim, work in the rain, or are simply prone to accidental drops near water. The Vivo T4, by contrast, is rated IP65, which protects against low-pressure water jets and dust ingress but does not cover submersion. In practical terms, IP65 handles splashes and rain confidently, but falls short of the peace of mind IP68 delivers.
In terms of physical form, the two phones are nearly identical in footprint — both share almost the same height and width — but they diverge subtly in how that space is used. The Vivo T4 is measurably slimmer at 7.9 mm versus 8.3 mm, and its smaller total volume (98.6 cm³ vs 104.9 cm³) gives it a slightly more compact, pocket-friendly feel. The Realme P3 Pro, on the other hand, is lighter at 190 g compared to the T4's 199 g, a 9-gram gap that becomes noticeable during extended one-handed use or long browsing sessions.
Overall, the Realme P3 Pro holds a clear design edge due to its superior IP68 waterproofing, which is a feature that directly reduces long-term risk of water damage. The Vivo T4 counters with a slimmer and slightly more compact chassis, but that advantage is incremental. Neither phone has a rugged build or a folding form factor, so for most users, the waterproofing gap is the deciding factor in this category.