I've got two recordings of Bach's Mass in B Minor--one from 1989, and another from 2000. Both with Collegium Vocale Gent (who does the best performances of Bach's choral works, from what I can find).
The one from 2000 is a better performance, but the recording is not as good, it's distorted in some places. The 1989 recording is better, but not as good a performance. I'll still listen to the 2000 recording any day though, because I like the actual performance better. It's very interesting to compare them.