NOT the same. Also there is a lot of misunderstanding between visa on arrival and visa exemption (which is mostly 30 days, but for some passport countries can be 15 or 90 days)
It depends on your passport which ones you are able to get. You have to start from there (possibilities depending on your which passport you have : go to website of your local Thai embassy)
Visa on arrival gives only 15 days and only to certain nationalities.
Or maybe you mean visa exemption ? Thailand has been back to exemption almost 2 and ½ years ago, but exemption only gives 30 days extendable by 30, whereas TV gives 60 extendable by 30 days.
can't squeeze another year out of non-O year extension based on retirement by crossing the border. You enter with the time left, which could be just a week even.
Need to do an annual extension at immigration.
The extra year by border crossing works for non-OA retirement.