Well, first time I played it on an Arcade machine, I was like, "Ragna=Sol. I play sol, this'll be a sinch." Then I put in my 50p and goddamn was I proven wrong. I played Ragna the whole 3 days the machine was there (conventions and whatnot), and then I got home and pre-ordered It for import on the PS3, knowing that I'd be playing Ragna. I'd tried others, but seeing as it was costing money, I stuck to tried-and-true.
Now that I own it on the PS3, though, I've begun to appreciate the rest of the roster. I Half-Sub Tager at the moment, and dabble in everyone else. However, now, I'm just being blown away by Bang, cause he's awesome, but I had no idea how awesome he was.
So for now, It's Ragna, but it's not definite. Could be Bang in about a week.