Another important issue to consider is which airport would you prefer to fly in and out of . Suvarnabhumi being the main airport caters for Thai smile , Bangkok Air and vietjet. Don muang have the option of Air A s__t ( just my personal feeling ) , Thai Lion and Nok . Getting in and out of both is easy , the express train from Suvanabhumi to town or the A1 bus ( very frequently) from entrance 12 arrivals level to Mo Chit SkyTrain station from Don Muang . Thai smile gives you access to Thais Royal Orchid plus membership , and Air Asia have the big points programme ....Personally I would pick Suvanabhumi Airport anyday , avoiding the herds of Chinese following the flag , and extremely long queues in Don Muang