I'm sorry, what was the question?
I think the question was Scott or Myles. Scott or Myles what?
I have seen both sing live.
If you're going with performance and sheer charisma I'd have to go with Scott. The man could work a crowd. He was sexy as hell when he sang and he prowled the stage.
I've only seen Myles in the rehearsal studio, so it remains to be seen.
If you're talking technical ability and command of his voice; it's Myles hands down. Listening to Myles is listening to someone who has mastered his craft and can wield his voice with precision.
I have heard and seen Alter Bridge. I heard roughly 12 songs. Not once did I think of Creed. They are NOT Creed minus Stapp. Not even remotely close.