He wouuld dominate. He was champ 11 years, what else do you want? He was not a belt holder, he was undisputed champ, beat best of 1930's, best of 1940's, and came back in 1950 and beat a few contenders. You can't say for sure????:?
Louis would do fine in today's picture. His punch at 200 or just over pounds has the power to cut up and take out just about any man ever. His combination of hand speed and power was freaky, as seen by the actual physical damage he did to opponents. Say a Lennox Lewis would be damn tough as regardless of his size he has some skills, effective awkwardness and timing to go with it. Wlad would obviously have his chance, he's a big hitter, but Louis would pose at least as much offensive danger back. I think Louis would cut down many of these guys.
Your right Wlad has every advantage, on paper that is. In the real world Louis would KO Wlad. He just was a better fighter all around.