Which of the two airports in Bangkok is more convenient?

Suvarnabhumi International Airport is more convenient.

From the convenience point of view, if your destination is in or around Bangkok, such as Siam Square, Jiushan Road, Grand Palace, etc. Then Suvarnabhumi Airport may be more convenient because it has more transportation options, such as airport express, taxis, buses and so on. Although Don Mueang Airport is close to the urban area, there are relatively few modes of transportation, mainly taxis and buses.

From an economic point of view, if you want to save some money, Don Mueang Airport may be cheaper, because its flight fare is usually lower at Napu Airport in Pitsuwan, and it is also cheaper to take a taxi or take a bus to downtown. Suvarnabhumi Airport has convenient ways such as airport express line, but the ticket price is relatively high. If you want to transfer to other means of transportation to reach your destination, you need to pay extra.