As Crossy says it depends on one's need.
I have lived in Chiang mai, Korat, Roiet, Nong kai and Fang as well as numerous holidays to the south that I have lost count.
Of them all, I like Fang best. I love it, but it could bore others to death. Its a bit of a back water with few tourists and I could count the other farangs that I have met here over the past 5 years on two hands. No traffic, easy parking, very low cost of living, friendly locals. When I roll up for a 90 day I am always the only one. Local hospital, dentist, mechanic and fresh food market are absolutely fantastic.
Our Sunday walking street is the best I have experienced in Thailand, ableit now closed due to covid.
Lots of community spirit.
Worst thing is the air pollution come burning season around February - March. No beach . . . but I have my own swimming pool, snooker, gym and hot girlfriend to amuse me.