I always thought Haye was more stylistically suited toward Vitali, though. People just got into too much thinking about Wlad's durability. But even stylistically, it is a case of Wlad's durability versus Vitali's activity, though. Still Vitali is the far more counter-able which is the way Haye operates.
Im going to go with Vitali by UD. As this has more to do with Haye running scared for most of the fight than anything else. It is pretty clear he wants to retire with the goal of not getting KO'd, rather than retire being heavyweight champ. This was apparent in his fight vs Wlad. Corrie Sanders and Lamon Brewster showed what it took to clip Wlad. Haye does not have that in any way, shape or form.
I mean, how long ago was that dude? And technically his corner threw in the towel, he was still punching back.
I'm in the "Vitali is a natural" camp and people still under rate him. He goes into the ring wanting to hurt his opponent. The only question is if Vitali remains healthy for the entire fight. Fighting Haye one handed won't be the same as fighting Chisora one handed.