If you install protontricks from the discover store it will list the folder id number for your installed games.

Proton prefix files are located in “home/deck/.steam/steam/steamapps/compatdata/”

I would use heroic. It’s well supported and fairly seamless. Takes some time to understand and some games might give you trouble at times, but I think it’s great.

Every one I’ve tried no. They run worse, or with some sacrifices. Running games with native pc ports through Switch emulation isn’t the way to go.

Wanting to use it with game pass is probably the best reason to go with a windows handheld. That and connecting with play anywhere games in the Xbox app.

I have a dual boot setup with the Deck, but its not a real smooth experience and requires a lot more hands on work to get it in decent shape.