Oled is noticeable larger, on paper it's only 0.4"diagonally but it's obvious having my lcd deck beside my partner's oled one, plus the oled one just looks a lot nicer. I've had more issues personally with some games not letting me scale down the ui, rimworld is totally playable on the deck but I find the interface gets in the way.

Steam deck xl could be an idea but you'd probably have some weight/ergonomics issues. Deck itself already dwarfs my switch lite (and is more comfortable to use...), do find I prefer some games on a larger screen, but it does usually work well at the distances I hold it.