GOG Galaxy is pretty good. You can integrate with just about anything so if I want to play something and forgot where I own it, I can just load up GOG and it tells me where and even launches it for me.
The stats are cool too. You can see how many hours you've played something on any platform (including consoles)
Lutris is a passable wine environment manager, surpassed by bottles.
My issues are with using it as a library manager and launcher, which is what Playnite is. Lutri's UI is absolutely atrocious for actually browsing your games. You don't use it for that either, apparently.
Everything Lutris does that I might need, is done better by other applications.