Tough to tell differences

Again, however, most viewers without the benefit of a side-by-side comparison will have a tough time identifying differences between any of the versions.

We definitely recommend the Blu-ray version overall--surprise, surprise--which also comes with a DVD, but, unlike many Fox titles, no iPod-friendly "digital copy." The Vudu version gives you five standard-def special features, about 25 minutes in all, but all but one, "Hardware," are available elsewhere. The PS3 version is fine if you want to save a couple bucks, and both disc-free choices provide some Earth Day cred by saving plastic.