I switched to Ultra from 14 PM, but I still got the 14PM so I can judge both I think and make it quite straightforward.
Display - great on both, colors are amazing, but more saturated on Ultra. I prefer the screen real estate of Ultra much more.
Performance - Same on both, zero lag, no problems, 14PM gets definitely hotter when gaming.
Battery life - I would say it is about the same, but it depends on so many things.. Can’t go wrong with either of them.
sPen is a nice to have thing that does not bother you when you don’t use it, so it is a plus, QuickShare works just as good as AirDrop, if not better sometimes. Camera quality is on par with 1x, Samsung is miles ahead in 10x, and video is about the same, though iPhone has the advantage of Dolby Vision.
If you want a breath of fresh air, go for Ultra, it is a fun device that has absolutely everything, and does not bind you into closed off ecosystem like iPhone will. Use 3rd party apps for sync and you won’t have an issue.
That being said, I will probably go back to iPhone at some point, could see myself buying 16PM next..