Not the person you asked, but one game I had problems with on Steam that I did not on GOG was the OG Riven. It was still playable, but the various animations associated with pressing buttons and suchlike were completely broken. Very rare experience though and I have played many retro games on Steam.

[–] Nibodhika 2 points 1 day ago

Never heard of that game, but I can definitely believe it, old games are where GOG really shines. But that doesn't seem like a DRM thing, more like the game is abandoned on Steam but not on GOG, sometimes GOG patches some old games with their own runtime, curiously if that is the problem running the steam version on linux using proton (and especially proton-GE) is also very likely to work.

[–] Someone64 4 points 1 day ago* (last edited 1 day ago)

Yeah a lot of retro games on GOG were fixed up with patches and stuff like that (often by GOG themselves) and sometimes regardless of any fixes applied, there are version disparities between the two platforms where usually the Steam versions is a slightly older release of an old no longer updated game compared to the GOG version though I’ve seen it happen the other way around, too.