Does Thailand have good hospitals, and does that depend on being in a big city?

We can source the money side of this, which is that visitors pay for care and that hospitals generally want a deposit and proof of insurance before admitting you: https://meetlocale.com/guides/is-thailand-safe-to-travel-alone What we cannot responsibly rate is clinical quality, and the gap people describe between major private hospitals in the cities and what is available on a small island seems to be the part that actually matters when something goes wrong. If you have been treated there, where were you, and how did it compare with home?