In person? GAJ by a long way, only because every time I was at the stadium he did something magical. I was there for both of his boundary line goals at KP and especially the one for Gold Coast is easily the best footy moment I've seen in the flesh, emphasis on in the flesh.
I've seen Franklin in the flesh 2-3 times and he always had a quiet game, personal biases aside he is capable of some freakish acts and I'd love to see one in person, but I never have. Likewise for Judd, I even saw him once in his Brownlow year at Carlton and he seemed quiet, though I'm sure he got 3 votes
For geographical reasons I've only seen Danger in person once since he joined the Cats, and it was the game where he copped a knee to the chest and had little impact afterwards, wish I had been there for the rematch when he channeled Ablett Snr. or his game against the Bulldogs earlier this year. He really has had some freakish performances for us so far.