I am currently using 12 mini.
Interest to buy a new iPhone.
Shall I buy iPhone 14 pro or 15?
15 will be good buy if you are ok with not getting full pro level camera system bro. 48MP Camera, USB C and 60Hz display are the highlights. AS you have not used 120Hz display yet, it shouldnt be a problem. You may consider 15 model.
But if you need Pro camera system, 120Hz display and ok with Lightning port then iPhone 14 Pro will be good buy with some good deals price.