Rd, I have both and you can't go wrong with either, the crystal mistress is just a little clearer through the yelp and the twisted sister a little bit raspier all the way through the yelp. Both cutt awesome and you can tone them down. I personally like the sister a little better but if you like a little less raspy call go with the mistress, in my opinion two best crystal calls out there and I own a bunch. Scoot
