I think those are two different vids. Crossroads from Albert Hall is Cream reunited. The Guitarfest, which I think was in Austin, has a lot of different guitar players, playing with a group or with Clapton and others.
Both have been on the tube and are great. I wouldn't hesitate to buy either. The Cream reunited is all Cream material and Guitarfest guitar slingers play different blues tunes.
Both vids are great.