ProtonDB is the go-to for a lot of people to see how games run on Linux desktop and Steam Deck, and while its rating system is far from perfect it's nice to have. A recent upgrade also makes it a lot nicer to browse.
ProtonDB now has separate tabs for easier browsing of Steam Deck or PC reports. You can also view a combined tab that includes reports from both.
Both categories can be pretty useful, but some game fixes can only be found in the PC section. A lot of the PC report creators are more experienced Linux users and know of fixes that may not show up in the Steam Deck section.