The UX differences are absolutely massive. Even after daily-driving that thinkpad for months, Gnome always felt kinda not quite finished. Maybe KDE is better, but it didn't have Wayland support when I was setting that machine up, which made it a non-starter.
The real killer though is battery life. I can work literally all day unplugged on the mbp and finish up with 40-50% remaining. When i'm traveling these days, i don't even bring a power cable with me during the day. The thinkpad, despite my best efforts with powertop, the most aggressive frequency scaling i could get, and a bunch of other little tricks, lasts 2 hours.
There are niceties about Linux too. Package management is better and the docker experience is _way_ better. Overall though, i'd take the apple silicon macbook 10 times out of 10.