Share 'Surge SS vs Avenger SS'

I've been reading differences between the Avenger SS and the Surge SS. I had bought a regular Surge a few weeks ago and I have already traded it for another disc. I throw my Avenger SS accurate, but not extremely accurate. (I have the FLX ESP btw) I've only recently really gotten good control on it. But if anyone has thrown the Surge SS, and the Avenger SS, whats different about the two discs? Th…