From early 2019 DGM download, 22nd much better than 21st, CLUB25
First, I will amplify comments on the page for the 21st as I screwed up and got this even though I have CLUB25 i.e. King Crimson Collector's Club 25 already. Had I realized I already had it, I wouldn't have gotten it again. Don't make my mistake, if you have CLUB25 already, there's no point in grabbing this, from what I can tell.
That out of the way, as of this writing (early 2019) the files from the 22nd have very good audio quality for the time period, and the performance is both strong and musical.
In short, if you don't own CLUB25, I would get the 22nd, and not bother with the 21st, given how similar they are, unless you are a completist.