FWIW, I have travelled on all three of our low cost carriers. My money for the long term is on GO for the simple reason that it offers a superior product at a competitive price.
Travel on Easy or Ryanair is for the penny-pinching morons whose sources of income will soon be drying up.
The discerning budget traveller will remain, but will require far better treatment than Easy or Ryan seem able or willing to give them.
Go GO!!!