Completionists - absolute, absolute completionists - would probably want to keep both releases. The LLL release is obviously complete and some prefer the sound quality, but the OST is edited differently!
I'm picturing a similar scenario to BSX's 3 disc release of David Arnold's Godzilla (1998) score - 2 discs of full score and a 3rd of "album presentation" score (not that that was ever released, but you get the idea).
I'm happy with just the LLL release now though.