I've tried most, and there ain't much difference - some are better at one thing, some at another. Never hesitated to use Ryanair, despite all the negative comments and I've always been satisfied. If I had my pick I'd go with Flybe as best all round, but short haul flights are exactly that - short. I can put up with anything for a couple of hours and a few more beer tokens left in my wallet.
Long haul though - a whole different ball game.