Dark Horse, obviously. Clean, crisp, funny and serves its purpose like a pop music video should. GUY was just another video added to Gaga's increasing list of unbearably boring & pretentious ART films.
Dark Horse. G.U.Y. is already overrated on here, it seems. Neither video is all that though. Roar and Unconditionally >>> Dark Horse, and Applause >>> G.U.Y.
What else to you expect the Katy fans say but that DH is better. It has nothing to do with Katy or Gaga' s videos. It is just their dislike for Gaga. So predictable.