very solid show. very JAMC'ish, i was most impressed with the vocal harmonies.
definitely a tough call, those are two excellent choices for you. personally i'm only so-so on experiemental/improv/free jazz/etc, so i'd go with the ravonettes, but i know it's big in your books and a festival of this type doesn't come by often.
sorry to only confuse things further. maybe you could club-hop and do both? the ravonettes' openers, black acid, can be skipped. they're decent but you wouldn't be missing too much.