Well, that battle's result is even easier to predict than Superman vs Batman. Dante doesn't even have particular weaknesses to exploit like Superman. You can only beat him if you're more powerful and more skilled. So Batman got no chance.
Deadpool's gonna lose too, imo. Doesn't matter if he can't die, a fight can be lost even if the loser is not killed. It's in the rules Wuodan set up too. And Dante's physical abilities are just too superior to Deadpool's: strength, speed, hand-eye coordination... without even counting Devil Trigger.
Yeah I'd say Deadpool is done for in basically every instance.