This is a hard one, and many of us are sure to be subjective. But as someone else said it here there are many categories to determine this. Artistic, realistic, technical, etc.
As a PC guy, I'm not subjective, I think the Playstation exclusives are the ones that are all round the best ones, I mean, for one they are the most polished ones for sure. I don't like the PS games in terms of gameplay, so I hope I'm not stepping on someones toes here, but as far as visuals, for me they are at the top.