The 512GB and 1TB Steam Deck OLED variants are identical in terms of specs, with the only difference being a glossy screen on the former and an anti-glare etched glass display on the latter.
If we recommend an action game for the Steam Deck, that means it can reliably run at 40 - 60 fps, but we're less picky with puzzle games that can sip power at 30 fps without hampering the play ...