Need help with Michael Jackson This Is It DVD!!!!!!!!!!!!!!!!!!?

I can't decide which Michael Jackson This Is It DVD to buy. I either want the 1 disc one from Walmart or 2 disc one from walmart. What I can't figure out is: does the 2 disc one have exclusive Michael Jackson rehearsals and footage or does it just have stuff about the backup signers and dancers? I would just get the 2 disc, but it's $10 more. That's quite a bit. It would have to be something that I really want to spend that much. Is the extra one hour footage on the 2 disc of Michael Jackson rehearsing or is it just about the dancers and the back-up signers though? I appreciate all of the help that I can get. Thanks!