I can't (and won't) answer for
@c0ppo but I opted for PopOS simply because it added a level of polish and features into the OS that enhances the end user experience. I also found that it was a distro that was compatible from the get go with the X1E. Ubuntu, needed some work and was unstable with the initial install. You certainly can add those features yourself to ubuntu.
I also agree, that you're committing yourself to a hardware vendor and there's no guarantee they'll continue with the distro. That was one of my concerns. I've recently wiped PopOS from my drive and I may try another distro. My issue as I noted earlier is that my remote access software does not work on linux - I use that 8 to 10 hours a day. There's little reason to use linux if one my major must haves is unmet.
I've looked at KDE Neon (user edition) with Plasma
I'm leaning towards trying that distro, I may download that into a VM and play with that and see if its worth carving out a couple hundred gig of my SSD to install
W10 is functionally ok for my needs
My thoughts on Linux vs. Windows vs. macOS.
Linux requires a heavier investment in customization and tweaking, either to make the system behave the way I want or just work. There's limitations on apps and drivers
Windows, less tweaking needed, but I can customize as much or as little as I want. For me, it basically works out of the box. Additionally, I have a nice suite of utilities that work nicely and enhance my experience. For instance, I use PhraseExpander to expand text shortcuts.
macOS, offers the best UX but the least in customization. The UI is probably one of the most consistent, and if you're an iOS user, you gain benefits from the integration from the combined usage. MacOS offers the least in flexibility and ability in tweaking. While I used a Mac for years, I always found apps like Office and GotoMyPC didn't work as seamless or as well as their window's counterpart. I managed obviously but I am enjoying the refinement that the windows version brings to the table.
I question why I want to use linux as windows gives me everything, and given that I cannot run GotoMyPC on Linux, Its pretty much sealed that I'll only be dabbling in linux - there's nothing wrong with dabbling but the OS cannot replace windows for me.