Depends. I’d love to say go with GOG whenever possible but they have some utter shit in their store. Like, old versions of games with bugs that were patched years ago or just plain don’t work. Dragon’s Dogma where online is completely broken comes to mind. So, I guess find out which version is the best on a game-per-game basis? I realize how much of a fucking non-answer this is and I’m sorry to have wasted your time.