Toronto definitely. If they win, it's fine - they have no chance at anything. If they lose, it's fine - it's to be expected. Boston has their cup, I want nothing but misery for them from now on.
I just know that if Toronto wins they'll start thinking they're good again which is annoying, I'd like to see them stay at or just below .500 for the whole season so they can get a crappy draft pick. Boston's obviously going to make the playoffs so I don't mind as much if they win.