Seconding the Steam Deck OLED! I got a third party dock for it, connected a screen/kbm to it and I have a setup to play my preferred way as well. But the actual console itself is really responsive, I just prefer that way of doing stuff :P
It should be able to run most games, except the big AAA ones. Forget about UE5 lol, but if you're used to a Switch expect something a bit better but overall similar preformance-wise. It has some really intuitive emulation software too, and the fact it can go into a desktop mode can enhance its customizability and it's honestly just really cool for me, as someone who is not used to consoles doing that.
It also has a microSD slot so I won't worry about the more expensive version with extra storage. You can get a card for way cheaper :P just remember to remove it if you wanna swap the case, lol.