Thailand provincial flights

Which air flight company do you think are the most reliable ? Recently I have had 2 flights from Don Mueang , re-scheduled ( same route but different dates 3 weeks apart ) . Then the same company ( Nok Air ) cancelled a Buriram to Don Mueang flight with 3 days notice . Follow on flight to Hong Kong already booked with another company . Much inconvenience and this is a regular scheduled flight . I can only assume that there were not enough passengers . A refund or alternative flight offered but no offer to assist in hotel accommodation which would be the case for an earlier flight the day before . Never had a problem with Airasia but they do not always have flights when I need them .