LMA ALL THE WAY!
If you can't figure it out, I voted Muppets.
Lights! Motors! Action! is an ok show but it suffers from too many long periods between each stunt, if they could find some way to cutting the boring bits out to get to the very impressive stunts quicker, than it'd soon become a guest favourite.
Now that the Muppets are "cool" again, the attraction should be safe for quite a few years now :o)
Someone should have intervened in James Rao's childhood and introduced him to the Muppets. Poor guy. ;)
LMA is one of, if not the, worst theme park shows I've ever seen. Terrible pacing, terrible set up, and terrible writing. Some of the stunts are interesting...but there just isn't enough meat on its bones.
MuppetVision, on the other hand, is easily the most entertaining 3-D show on Disney property. From the minute you walk through the doors of the Muppet Show Theater, you're transported into that world. The great gags throughout the small indoor hallway and the preshow room, as well as the best preshow in WDW, just push it over the top.