15 hours in and Red Dead Redemption 2 is the best open world game I've played. It's better than The Witcher 3 when it comes to exploration, gameplay, immersion. Not sure if the writing/story is better yet. Will see in time.
If you are worried about PC release and optimization definitely wait for more patches. It's crashed twice on me, but runs better than I thought it would on my 1060 3gig, 8gig ram, 1700x. Average 55 fps, with lowest never dropping below 30. But it took a lot of finagling with settings. I'm on mostly medium with some low settings. I haven't noticed any stutter, which I normally can when a game drops to 30fps.