Oh man, I am a bit disappointed in this thread. Too much focus on graphics, too many judgements and a weird focus on the technical side of two unreleased games. I know you better, GAF.
Personally, I am very much looking forward to my free Plus-Version of Driveclub. I played it at both E3 2013 and 2014 and am happy, how it came along. The graphics, in action, did not woo me terribly. But the game is fun. Simple as that. I am most concerned about track design and overall variety and scope.It is really hard for me to judge, how long this came could be interesting for me. But overall, very positive. Great game for PS4.
Horizon on the other hand did not impress me that much at E3, but that is mostly due to quite a bland, shallow presentation. Graphically it looked nice. Really nice. Different artstyle. More colours, not so much realistic, but fun. The offroad-part was terrible, but I plan to ignore it anyways. I like the diivatar-ideas there and think, it could really enhance the Horizin-Formula. And even if it is nothing more than "More Horizon", I am a happy man. Great game for XBO.
And then The Crew. Graphically kind of hideaus, but HUGE and fun. It reminds me of Driver. SF. Simple, fun car-action. Nothing too serious. But fun. Also really looking forward to the game.
Oh and I noticed some detailpops while playing Driveclub. The patches of flowers at some tracks popped up very close the the vehicle. Take that or leave it