

Depends on what your usecase is.
My brother wants to play demanding AAA games on a big screen. He doesn’t see the point of a Steam Deck and is about to sell his.
I play indie games and emulated retro games. The Steam Deck is perfect for me to play. I can sit with my kids when they play in the back yard. The hardware isn’t going to go out of date for me for a very long time.
Things for you to decide:
Which desktop environment do you want (KDE, Gnome, Cinnamon, cosmic, etc)
Do you want it to be super up to date all the time? Or are you OK with slower updates for a more stable system?
Difficulty: How hard do you want things to be? Do you want things to be set up and lots of solutions online? Or are you willing to dive deep, do stuff yourself and figure stuff out?
I started with OpenSUSE Tumbleweed and loved it. Highly recommended. I didn’t know about TuxedoOS at the time and that seems like a good place to start too. Noe I know more and am on CachyOS and am super happy with it.