The Cavs- Mo Williams has proven to be a better player than I expected. The same is true for Lebron (as mentioned in a previous post) as I didn't expect him to apply the effort on the defensive end that he has this year. I attribute this to his Olympic experience.
However, despite Mo's obvious skills, the Cavaliers as simply TOO heavily dependent on Lebron. While I'm not sure I could devise a method to slow him, I wouldn't put it past Tex Winters and Phil Jacksn to figure something out. If they CAN find a method to slow him even a little bit, the Cavs will be in SERIOUS trouble.
The Lakers are simply a more talented offensive team. They downside is that they employ players who have defensive talent but not the mistake-free basketball IQ that you need in the playoffs. Lamar Odom, for example, obvious has the athleticism and size to have a chance at slowing Lebron- not to mention Kobe. However, Odom lacks the mental game to allow him to truly fluster James- a player with superior basketball IQ. The same is true of Trevor Ariza.
This, of course, leaves Kobe- a rather risky prospect considering the dangers of foul trouble and the emergence of a post game in the Detroit series. I seriously doubt Kobe could handle LBJ backing down due to the weight and strength issues.