The Heat are without question the more efficient offensive and defensive team. Milwaukee's only big advantage over the Heat is that it can rebound the ball well and Miami can't.
Most everything else swings in Miami's favor.
After the Heat dismantled the Bucks 110-87 in Game 1, that should be obvious, if it wasn't already.
Let's take a look at those specific advantages, which seem to indicate that this series is headed for just four games.