For me with a 256GB XS its face ID. Maybe its the fact my beard is white, or my hair silver white one side and darker grey the other (it has faded that way not dyed) but its a bit hit and miss, more so that touch ID, I miss the simplicity of placing my thumb on my old 7 and being at the home screen. Being out in the wheelchair I find the extra swipe up to be an annoyance, why cant the phone just open up to the home screen after you look at it if you want, there should be a setting for that so people have a choice. Aprrt from better battery life tbh iPhones are all the same these days it feels, although I do love my iPhone I am aware or how fragile it is, I wish Apple could have made a really hard ceramic maybe not glass which seems like the cheapest option for fast charging. Then again I'm not an engineer so what do I know. I would say for my disability the larger phone is not as user friendly, that's why I did not get a max.