Squid is very slippery, Galleon is painfully slow, Spire I haven't flown ever, Mobula is fun but doesn't quite bring the feel of a Pyra, Junker is fun but not a lawn-dart, and Goldfish, which is my 2nd/3rd favourite ship, is really easy to maneouver. Too easy, it doesn't bring the challenge of a Pyra, predicting where you're going to have to turn...
Also, the Pyra has a nice weight to it, and there isn't much more satisfying than flying through things.