This, like the Follies cast album recording, is another argument for the ages.
The OBCR, while having the iconic performances of the original cast (and especially Jennifer Holliday), it is severely truncated, and the songs are presented "pop" album style, with fade outs for many songs, instead of the "button". If they actually recorded the full score without the "pop" style, there would be no argument here about which one to get.
The Actor's Fund concert, while being a complete recording, is recorded live, so you have to live with all the audience cheering and hand-clapping through the songs. I also am in the minority of not really enjoying all the performances. Audra's voice seemed to be too "strong" for Deena (the whole point is that Effie is supposed to have the bigger, stronger voice, I thought). And I didn't enjoy Lillias' showboating on "And I'm Telling You". All this may have been fine sitting there and watching the concert, but as a pure cast album, it doesn't quite work for me.
There's always the movie soundtrack, which I end up listening to the most, even though there are new songs, some cut songs, and some re-arranged songs, but the cast gives a fairly strong performance.
And there's also the Korean cast album, which you can probably skip, though it is the basis for the current tour (and it wouldn't surprise me if they just re-recorded the vocals of the girls on the current tour and place them over the tracks on the Korean CD, which means another Dreamgirls "highlights" album, unfortunately).
Xanadu! Can't cry on cue!