Who wins? I'd take DM, personally. Prime DM was a better fighter than Canelo imo, IN ADDITION to being a much bigger man. I don't think Bivol has enough power to keep a prime DM off of him.
I'm assuming you are talking about Dariusz Michalczewski. I'll take the Tiger to beat Bivol convincingly. A more explosive match up would be DM vs AB.
DM is likely too strong. He did overpower Hill, who I consider better than Bivol. However, if Bivol completely schools Beterbiev and shows he has another gear to go into, I'll probably reconsider. But beating Beterbiev will not prove he can cope with DM's jab.