What are the differences between Non-Immigrant O-A and Non-Immigrant O-X visas in Thailand?

One is valid for a single year (meaning you could get 2 years of stay out of it if you work it right) the other is valid for 10 years (getting you stamped in for 5 years every time you enter the country).

An O-A requires 800K baht or the equivalent, and the O-X requires 3 million baht and has limits on how much of that money you can take out of the bank AND requires mandatory health insurance,

Here's the O-A and O-X requirements from the thai consulate in Los Angeles for example.