i prefer the use of fixed blade b'heads myself as they are very durable and reusable and when sharpend correctly will penetrate with the best of broadheads.
many notable bowhunters recommend fixed 2 blade in lighter draw weight bows for better penetration as they don't expend energy cutting with 3 or more blades.
i'd like to try the g5 or b52 but cannot justify it at the moment as i have many grizzlies, zwickey's, snuffers, ma-3's and ribteks on hand...
i've never had problems with flight or penetration with fixed blade from recurve, longbow or cambow mounted on wood, aluminum or carbon shafts.