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Got a retroid pocket 3+ and quite enjoying it
(hexbear.net)
Although every review or video that mentions it can run ps2 and gamecube. It can't. Also aethersx2 has been abandoned and is closed source. Also android sucks.
But so far its a really nice ps1 portable device. Usually I'd use my vita but I'm always worried about damaging it and they're not exactly in production so I wanted something more disposable with L2 and R2 buttons. Now i can play Abe's Odyssey/Exodus on the train :D
Refurb 64gb steam deck and throw in a 1tb SSD is the best option for that. Comes out to about the same price as a new 64gb but with double the storage of the way more expensive 512gb. Pretty much everything works with proton except games with certain anti-cheat.