Fair enough, everyone is entitled to their opinions I suppose.
However, I don't see any huge technical reason why a 189 seat 738 is not right for a SOU but a 186 seater A320 is.
I've a feeling that is fuelled purely by people's personal feelings towards the individual operators of the aircraft.
Personally, I've never really found a huge difference between Ryanair and easyJet. Much of a muchness in my experiences.