Compare Mobile Phones Side-by-Side

Based on these core specs, the iQOO Z11 5G is the easier phone to recommend. Both phones use a 6.83-inch display, a MediaTek processor, and 8GB of RAM, so there’s no clear advantage for the vivo S2 5G in the basic performance setup shown here. Where the iQOO pulls ahead is in the parts you’ll notice every day: smoother screen motion and much stronger battery headroom.

The 165Hz refresh rate gives the iQOO an edge for scrolling, gaming, and general responsiveness compared with the vivo’s still-good 120Hz panel. The bigger difference is battery capacity: 9020mAh versus 7050mAh is not a small gap, and it makes the iQOO look like the better pick for heavy users or anyone who hates battery anxiety.

The vivo S2 5G is not weak, but from the specs provided, it feels harder to justify unless it is significantly cheaper or has advantages not listed here. As this comparison stands, the iQOO Z11 5G is the stronger buy.