The Canadians have gotten bigger on the defensive end. The Maple Leafs have slowed down their up-tempo style adding lots of age while dialing back some of their youth. They won't be afraid to grind more now. So I don't see a fast-paced game. 
Carey Price had a bounce back year last season. A return to dominance from Price makes Montreal tough to score on especially with its added size. 
The Canadiens closed out last season going Under in six of their last seven road contests. Toronto went Under in its last five home games last season.