i went from 15pm to 17pm. I sold my old phone back to apple for £480 so this phone is now costing me less a month than my 15. Tbh there really isnt much difference. I prefer the finish by far on the 15pm.
The battery is better, but perhaps thats because its new at 100% whereas my old one was 86. I do like the camera button on the side and the 17 is also cooler than the 15. Truthfully though, for me, thats pretty much all i notice. For me too, ios 26.1 is a mess. Stuttery and just not very good. so im not too happy with my 17pm at the moment.
Anyway , its not a huge upgrade, if you have spare cash and use your phone a lot then go for it.