I tell you what...something I forgot to take into consideration, which could swing my vote...
Batman's intelligence.
Not his prep-time, his sheer intelligence and his psycho-social skills.
Batman, knowing history about Doomsday, I think, has a great shot of pulling one of his trademark "talk the villain into submission" techniques. Superman is an idiot, all he ever does is start pummeling. Batman takes his time. Who knows, maybe Doomsday needs something that Batman can offer. Batman's a scientist, and as someone mentioned before, Doomsday is a genetic experiment. Doomsday apparently knows this now, so Batman can just talk to him. Listen, what is it that you seek in life? Do you just want to kill everyone or do you want a purpose? Do you want pleasure in return for all the pointless pain you were inflicted with? Maybe I can help you, if you let me.
Doomsday might be too nuts to fall for it but its a shot.
Lol...
How you dare to call the man who kill Superman a simple "genetic experiment" Just tell me how Bruce chould take the ultimate weapon of destruction... By what... By What...Prep time ? lol Batman have no chance. Doomsday is just a warmachine who don't talk to nobadies any kill every man he see so don't talk about Batman's "talk the villain into submission stance" no please.
Sorry but one way match here...