Is there something wrong with steam or does gog have something better to offer? It's been hassle free for me with steam for ANY game. Just wondering.
The games are DRM free and you own them, as far as you can own software. The GOG website is simply a convenience.
One example in which this can be relevant is if you want to legally transfer your ownership of the game, for instance if you die. In the EU this is always legal for digital games (clauses in EULAs prohibiting it are void) but Steam DRM is reliant on your Steam account ... and as of yet the EU has not said anything about transfer of such accounts. Valve prohibits it, so at the moment a Steam library basically dies with it's owner from a legal perspective.
PS. presently the GOG ToU doesn't even prohibit transfer of your account, even if that changed everything I said above remains true.
PPS. nice to know D:OS doesn't use the Steam DRM though.
