visa on arrival is 14 or 15 days, non-extendable whereas a visa exemption is 30 days and extendable once for another 30 days. Yep...completely the same thing 🙄
I seem to remember reading you can do the test & go if there are approved blue zone places within a 2 or 3 hour drive of your arrival location, eg Pattaya is fine if landing in BKK.