Body of work (defenses longevity etc) put Vitali higher on my list but his resumé is weak.
Brunos is quite weak itself.
"lasted longer" is a poor choice for an argument as most with two functioning eyes could see that Klitschkos performance vs. Lennox upped his standing the the boxing world.
To act like he got crushed is silly. Cuts happen and i think Lewis had some momentum, but Klitschko did very well.