Ryanair do not fiddle their puntuality times. There is a reason they are more punctual - the airports they serve!
Your much more likely to get held up at busy airports (eg U2 at Barcelona, Madrid etc) compared to FR at Girona, Reus or Vallodalid. Thats just common knowledge and its very clever advertising on behalf of Ryanair to exploit this fact.
My opinion of Ryanair is they need to do this advertising (continously slagging of Easy, BA etc) to pull the wool over the passengers eyes over the distance of their destinations from where you actually want to go. Easy don't have to this as they will attract passengers from wherever as they fly to the major airports in cities.
(PS before I get attacked for this, I would like to point out I have no preference over Ryanair or EasyJet!! I use whichever is cheapest or who flies the closest to where I need to go!)