I'm considering upgrading my XS to a 15 Pro so I can pass it down to my mom. It'll be a nice upgrade from the 7 she has. I already know I'll miss 3D Touch for typing and editing text.
Do you notice the better cameras or battery life? What about the 120hz display? There's been so many times I wished my XS could take low light night photos or just better zoomed photos in general. Taking a nice photo of the moon or night sky is impossible.
There hasn't been a drastic change in iPhones since the intro of Face ID. The UI has been the same forever.