I went from the 14PM to the 17P last year. Every day I both appreciate and regret the switch. I like the lighter weight (at the time 14PM was the heaviest iPhone), it's easier to use one-handed, I drop it less, and at times find myself really liking the form factor of the Pro.
I also miss the larger display of the PM for emails, photo editing, texting, and larger keyboard layout, Teams, YouTube videos, and overall size of information on the screen. More and more info seems to be in menus that require scrolling, and the OS seems like it's designed more for the PM size display despite not really scaling to take full advantage of the difference.
I'm incredibly torn on upgrading this year solely for the switch back to a PM. The 18PM is going to be heavier than my 14PM, and with a case, it will be even more so. There's also the added cost. I was hoping there would be more of a difference between the P and PM versions so it would make the decision easier. The C2 modem just isn't enough of a difference to push me one way or the other.
I didn't mention battery life because I always have access to a charger during the work week, and usage just isn't that heavy because I'm in front of a computer. On weekends, I've never had a situation where I'm not without a fair amount of life left at the end of the day even with heavier usage. In the car, I use wired CarPlay, so it's also charging when I'm on the road. Battery just isn't something I think about anymore.
I have no idea if any of that helps. There are trade-offs and compromises with either choice. You do have a two-week return window, and that should give good insight into whether or not you can live long-term with whatever you decide.