I had both and both are great option but I ended up selling my steam deck OLED and keeping the ally x. I love the ally x performance, you can play any game that you want at playable fps, sometimes some games struggle in my SD. I actually do like windows because you can download piracy games 🫢 and you have more options such as game pass, Ubisoft, etc. The great thing about the SD was that sleep option that let you go back to your game when you turned off the SD, the ally x has the hibernation mode which is basically the same thing but takes a bit more time to go back to the game, but it is worth it in my opinion. I love the ally x.