Trump.
I think Cruzsdadgate is going to hurt Cruz and it's going to be irreparable. If a guy like Ben Carson ran some shady ads that fabricated quotes, people would be willing to write it off as the fault of Carson's people because they believe the doctor is such a good guy. He couldn't possibly have anything to do with it himself, he's too nice.
With Cruz, most people believe he's shady and weasely. He can't afford any controversy that confirms that suspicion. And not we have a second instance of his ads filled with fallacious quotes meant to smear somebody. This confirms the biases against him people already had, and they're not going to give him the benefit of the doubt like they would Carson. They're going to say, "That Cruz...I knew that guy was a snake! I don't believe for one second that he didn't know what was going into those ads and that they were bogus."