I would go for the 15. I made the switch from a 13 PM by the way. The 15 has everything you need however if you want ProRes, ProRaw, macro photography and a longer telephoto zoom, the 13 Pro is the way to go.
Can third party macro and zoom lenses address some of iPhone 15's shortcomings?
you kinda need to try a 120hz display and then the 15 wit the 60hz to decide.
personally I don't care about the 120hz, but some people say once they use it they "can't go back"
you should find out if you're one of those people