I can only recommend the cheapest Steam Deck, and only if you're willing to either open it to upgrade the internal storage or rely only on micro SD cards. The Steam Deck gets decent performance on most games but decent is defined as 25-45 fps for 3D games and 60 fps for most sidescrollers.

I mainly use my Steam Deck to stream games from my PC at home to my cubicle at work, I am still astonished that my upload speed on coax is substantial enough for very low latency streaming. I prefer it over my laptop because the Steam Deck takes up less space on my desk docked or with a case that has a kickstand like dbrand's Killswitch. Still boggles my mind that this OLED version doesn't have a kickstand either.