Still not sure about MS's Xbox app, because so far it still seems to just be pushing Gamepass, and I've zero desire for Gamepass. I want that app to be more like GoG/Steam. That said, I am greatly looking forward to GoG Galaxy 2.0.
That's largely because its in Beta at the moment, so features are a bit limited. But the reception seems positive so far. It's a lot better than the Windows Store, so that's something.