I don't have this music in this release or the 2CD edition. Is your interest sustained over the whole set or is the 2CD set a reasonable "best of" ?
My opinion is to get the box set. It is consistently interesting. With the box you get complete sets which honestly gives you a somewhat different and better (IMO) view of how the whole gig unfolded. The 2 CD is certainly fine, but once you've heard the box, you'll hear the music quite differently and you won't want to go back. And you could always make your own "Best of" set from the box.
John, I could not phrase any better