Whoops--I'm replying 9 months late but here goes:
The Nonesuch recording has a lot more separation between the instruments. It actually feels like 18 musicians, rather than one throbbing, breathing mass of life, as the ECM does to me. I prefer the original because its so unusual and singular in that way.
Also, the Nonesuch version is longer, but I don't exactly know which parts are stretched out. Everything over 45 minutes and under an hour and fifteen minutes seems the same to me anyway.
I've been listening to some other renditions recently. The Ensemble Signal one is very good. Even more separation than the Nonesuch recording according to my memory.
The Grand Valley one is excellent as well.
I haven't heard the others, but there are very few. It wouldn't be very expensive to purchase every commercially available performance of the piece. It'd be an objet d'art to own 5 or 6 versions of such a minimal work of art, I suppose.
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