I suppose it depends on the parents. Not only what type of education they want for their children, but also what they can afford.
Besides temple and government schools teaching a Thai curriculum, there are many International schools here, both good and bad. All teaching according to various internationally recognised curriculums: US, European, UK etc. Some with amazing facilities, far better than I ever had at grammar school in the 70's.
If you have the money, I have read (although it may be wrong) that the two best ones are Pattana and NIST. Both in Bangkok.
We are very happy with the education our little one is receiving in a small international school. More importantly, she loves it there and looks forward to going each day.