Downgrading from Iphone 11 to XS

Hello everyone, Im think of downgrading from Iphone 11 to xs due to the capacity, i need 256 at least and mine is 128, also the oled display, thinking of the ios 18 update It is nice to hear its still supported, I will buy maybe 15 or something a year or two from now

But my main topic is, does the camera and battery have big differences between these two or not that much?