Big man with skills vs bigger man with skills. This fight possibly jab battles and involving psychology (Fury trying to get into Douglas's mind ) 12 rounds in which could be an underrated clash .
If we are talking Tokyo Douglas here then it isn’t even close. Douglas by late stoppage or unanimous decision for me.
Fury would find a way to win because at his best that’s what he did. Height, reach, speed, sufficient volume, tough, durable, gritty.