At the moment? BG3. Only BG3. I'm 170 hrs into the game and there is still so much more to do and to see, I can't imagine myself playing anything else for at least a few more months. Except maybe for the occasional round of Carcassonne when I need a quick fix.
I have so many good games on my SteamDeck I haven't even played yet ... I bought a few HumbleBundles and indulged in the Steam sales when I first got the deck (I did not really own a gaming pc or console for many years before that, so I have quite a few really good games to catch up on). The Witcher 3, Skyrim, Protal 1 and 2, Firewatch, Forgotten City, Divinity: OriginalSin 1 and 2, ShadowTactics ... all waiting for me to finally get through Baldur's Gate 3.