Wladimir. Vittles seems like a bit of a cantankerous old SOB who can't accept legitimate defeats, and seems to lose his cool too easily. Wlad's much more laid back and looks to be the more fun to hang out with (though he'd probably steal your girl).
Vitali is 42 almost now so dont expect fireworks but when he was 27 thur 32 years old he was great to watch
Vitali has the demeanor of a true fighter. The dude comes to bang and get his guy out of there. I'll watch his fights. I won't watch Wlad's. That said, I find Wlad to be an engaging person and love his interviews. Vitali doesn't come across as personable. But, I watch boxing for entertainment, so I'll pick Vitali.
I think Vitali is the better boxer, tougher and more durable but too easily hit , whereas Wlad is the opposite but harder to hit. I like Vitali better but then again his record is an embarrassment.
They do their talking in the ring which is why I like them. I prefer Wlad as he's had a harder road and come out a winner but is still a humble guy.