I think that the unbeaten Peter beaten by Wladimir (on neutral ground) was alot better than the Peter beaten by Vitali (in Germany). I think Peter was beaten before the fight even started, kind of like Brewster in the second Klitscko fight.
Wlad, he's beaten better comp. Vitali being called linear doesn't wash, there is no linear champion imo until the three major titles are unified, which it doesn't look like will hapen until one of the brothers retires. If the two fought, I think Vitali would win and I also think he's a better overall fighter but Wlad has just done more.
Wlad. He has pretty much cleaned out the division over the last 4 years. Vitali is obviously #2 and may or may not be the better fighter. I personally think Wlad is a more complete package at this point, and would probably win head to head.
Someone mentioned mamma klitschko. Were either Mom or Pop at the fight? For that matter, do Mamma and Pappa Klitschko even know what their kids are up to? Is there a Klitschko sister? Or evil Klitschko step brother?