I've got both of them in my tank at home. I personally like the purple hornets more due to the fact that the skirts actually do change colors (purple, yellow, purple, yellow) it amazes me when things of nature do that kinda stuff. such as a target mandarin.
anyways. I personally don't feel like either of these are worth the prices they are fetching online. but due to ebay, it's not the sellers fault, but the buyers for bidding that high.
single polyps of purple hornets have easily reached over $200+ and a single polyp of the captain ahve reached atleast 150+ if not 200. Never watched the ending of an auction, just the beginning.
people that know i've had the z's and p's online have sent me rediculous offers, but I'm not selling untill they're a nice colony. I'm always willing to trade for something I don't have...but not selling.