Compare Mobile Phones Side-by-Side

The OnePlus Ace 7 Pro is the more aggressive phone here. Its huge 9000mAh battery, larger 6.78-inch display, 185Hz refresh rate, and 12GB of RAM point to a device built for long sessions — gaming, streaming, multitasking, and generally not worrying about the charger. If performance feel and endurance matter most, the OnePlus has the stronger spec sheet in the areas people notice every day.

The Samsung Galaxy S25 Slim makes more sense if you want something smaller and likely easier to live with one-handed. Its 6.3-inch 120Hz display is still smooth, and 8GB of RAM is enough for normal daily use, but the 4500mAh battery is the big trade-off next to the OnePlus. Based purely on these specs, Samsung looks like the cleaner compact choice, while the OnePlus is the one I’d pick for power users and heavy screen-on time.