Quinn has been better in all of the main categories than Clowney over the last few years.
No one could've predicted that Clowney was going to still be available. He wanted too much right off of the bat and like someone else said, he likely signs with the Browns (or Titans or Seahawks) and tries his hand again next offseason.
He's a big name, no doubt, and his splash plays are insane, but consistently speaking Quinn is the better player.