I'll say the Celtics.
If for no other reason then chemistry. Sure, on-court neither team is playinf very cohesively, but at least the Celtics don't seem to mhave the off-court turmoil the Lakers do.
Also, if you look closely at how the Celtics have been playing, you'll see that we do have stretches where we play pretty darn good. These stretches are when KG is on the court.
So, add in a healthy Bradley, and as long as we can get to the playoffs, where KG's minutes will go up, and I think we still have a good chance to make noise in the playoffs. People will just have to accept we aren't going to be a regular season juggernaught.