Both phones share an identical 194 g weight, so neither has an advantage in hand feel from a mass perspective. Where they diverge slightly is in overall footprint: the Oppo A5 Pro is marginally slimmer (7.8 mm vs 8 mm), narrower (75.5 mm vs 76.2 mm), and shorter (164.8 mm vs 165.7 mm), resulting in a meaningfully smaller displaced volume of 97.05 cm³ versus 101.01 cm³. In practice these are subtle differences you might not consciously notice, but the A5 Pro does pack the same mass into a more refined, pocketable shell.
The most consequential design difference is water protection. The Oppo A5 5G carries an IP65 rating, meaning it can handle dust ingress and sustained water jets — fine for rain or splashes, but it is not rated for submersion. The A5 Pro steps up to IP68, which certifies it against full submersion in water — typically up to 1.5 metres for 30 minutes. This is a real-world upgrade that matters if you use your phone near pools, in heavy rain, or in environments where accidental drops into water are a genuine risk. Neither phone is built to a rugged standard, but the A5 Pro's rating offers a meaningful extra layer of confidence.
Overall, the A5 Pro holds a clear edge in this category. The marginally slimmer and more compact chassis is a minor plus, but the jump from IP65 to IP68 is the decisive advantage — it elevates the device from splash-resistant to genuinely waterproof, which is a qualitatively different level of protection for everyday use.