Compare Mobile Phones Side-by-Side

The iPhone Duo’s biggest advantage is obvious: that 7.6-inch 120Hz display gives it far more room for multitasking, reading, gaming, and media than the OnePlus Ace 4. If you want something that feels closer to a small tablet while still being a phone, Apple’s device is the more interesting pick here.

The OnePlus Ace 4 looks like the safer, more conventional buy. Its 6.78-inch 120Hz screen is still large and smooth, it has the same 12GB of RAM and 5000mAh battery capacity, and it should be easier to handle day to day. Since the processor details are vague beyond Apple versus MediaTek, it’s hard to make a fair performance call from specs alone.

Go for the iPhone Duo if screen space is the priority. Pick the OnePlus Ace 4 if you want a big-screen phone without moving into oversized territory.