OS size: 11.1 GB: Battery. Capacity: Wi-Fi 5 (802.11 a/b/g/n/ac) Wi-Fi features - Dual Band Apple iPhone XR vs Apple iPhone 15 Pro Max. 6. Sorry. 11 has a tad bigger battery but also it lasts longer. Newer soc and 1gb more ram gives it a better chance of being supported longer. All the videos I’ve seen of tests show the XR as the winner over the 11. The reason for this is because since there’s less RAM in the phone there’s less power being used. tgUWG.