I recently just did both in a rotation I'm doing. I think they are pretty similar in that they are both endurance workouts and hit every major muscle group. In looking at my sheets from the Cathe Compendium (I love whoever did this) it looks like the weights are similar but vary a bit here and there, as to the specific exercises.
I personally prefer ME, since it comes with Boot Camp, which is a terrific workout. Plus, I hear there is a BC/ME premix which is killer, although I have yet to try it.