Well, the thing is they historically weren't a budget airline. They've taken on some budget airline attributes, but mostly not the dark patterns. Yet. They'll get there.
Ryanair is the biggest airline in Europe. Everyone competes with them. I found if you are traveling with family, need a checked bag and seats - Ryanair has no price advantage over other players.
Their trans-Atlantic flights are ok and cheap relative to United (out of IAD, to points in continental Europe). Their EU flights are a noticeable step down.