I am a truly terrible pilot, so if I have serious intentions of succeeding in a match, I usually try easier ships, like a pyra or a goldfish, though so far I've always died with the goldfish.
Otherwise I like flying squids a lot, but do not expect me to actually harm someone with them.
What I don't fly: galleons and spires. I sometimes try junkers, really wanna learn them, but I'm not as good with them as I should be. And flying a mobula is still a mystery to me, tried it like once, and failed miserably.