We used AirAsia last year from BKK to PHK and were pleased with their service.
We are using AirASia from BKK to Chiang-Mai and then 1-2-GO from Chiang-Rai to BKK.
I have a free return flight with THAI from BKK to PHK and my mate will use AirAsia.
As you mentioned, it depends on the individuals situation and my mate and I go with what we think is cheap but at the same time reasonable.
