XanatosForever
Steward of RP
Given his ideals, I think Aurel'd favor Soresu over other forms, but with his personality and passion for swordplay, I certainly don't see it as impossible for him to to have actively practiced each form to get a sense of how it works. In this case, his least proficient forms I would imagine to be Jar'Kai (he doesn't strike me as much of a dual wielder), and Vaapad, since I don't imagine Master Windu being very open about sharing its practice. He'd probably favor Makashi in duels, and Shii-Cho would certainly be a sturdy foundation for everything.
Hope this isn't so old that it's dead, but given Aurel's specialty, I couldn't help but say something.