It's the one with the ABBA songs.
Check out this smart New York Times review of the movie by A.O. Scott. He sums it up well:
You can have a perfectly nice time watching this spirited adaptation of the popular stage musical and, once the hangover wears off, acknowledge just how bad it is.
I do disagree with one part of Scott's review. This wasn't the worst performance of Meryl Streep's career. That was "She Devil." Streep is actually a pretty good vocalist.
Pierce Brosnan, on the other hand, was a poor casting choice. U.N. conventions should be passed assuring he will never again sing in a major motion picture.