Oddly enough I have Wlad winning that one for a couple reasons.
1. Wlad knows Vitali's style as they used to spar and Wlad has seen Vitali train on numerous occassions.

2. Wlad is hands down the better BOXER

3. I think Wlad has always hit harder than Vitali

4. Wlad's jab is 100 X's better than Vitali's who does just paw with it.

5. As a younger brother myself, I think all little brothers when pitted against their elders really try to prove themselves whereas the older brother may just try to go easy on them. This is subconsciously of course.

I wonder who Manny Steward would pick