Both Stu and Billy are amazing bassist. I've had a chance to see both live and I have their respective videos and those DVD you guys are mentioning.
stu has really takin piano style tapping on the bass to a new level. His stuff is way difficult to play and he pulls it off w/ ease. Stu's got that independent lft & rt hand thing happenin and most of his solo material translates well into songs.
Billy is a shedder. Hes got that 3 finger right hand technique that allows him to play anything. The guy can groove as well, the walkin line from colorado bulldog is a great example. But he doesn't seem to wanna slap. So what. If you watch the live in Astoira he actually slaps and its simple octave stuff that stu intially did on Vai's album. But heck, Billy got that one finger tappin technqie very similar to wootens, thumbs, hammer pop technquie. billy does it, tap, hammer hammer tap. sounds similar, looks different. Anyway these guys are both amazing to see live. Billys a great rock-n-rollbassist, and Stu seems more diverse musically, but heck you can't knock either.
The shy boy opener in Astoria DVD is almost note-for-note from the talas album and if you had a chance to see David Lee roth when Vai and sheehan were his band, you would have seem this stuff live.
Cool stuff
frank