Was also confused but I think I’ve made a decision.
While O visa has less requirements on intitial entry to Thailand, when the 90 days is up and you apply for an extension, you’ll have to gather all the same info as if you were to apply for an OA.
So, if you pass all the requirements for an OA, why not just do that in your own country and then you have a year before you need to go through it all again in Thailand for the extension.
, so thinking this through to utilise the 65k p/m option, I’m probably better off applying for an OA in UK. Once in Thailand I can transfer required monthly 65k and when 12 months is up and applying for the extension, I’ll have the necessary recorded money transfers. Does that work or is there something I haven’t thought of?