The best option is a taxi if you prefer comfort and private travel. However, be aware of the higher cost.
Traveling from Suvarnabhumi Airport to Chumphon takes approximately 395 minutes, whether by taxi or other transport. Both options are provided by 12Go, with prices ranging from 6380 to 15400 THB. Consider the relatively high cost and long travel time.
The cheapest option is also the taxi, but keep in mind that the price is still high, ranging from 6380 to 15400 THB.
For families, a taxi might be the most comfortable choice due to privacy and the ability to tailor the trip to personal needs.