Which is the best bank to use when opening an account for a non-immigrant O retirement visa .  I will be applying from Chiang Mai. 
Answer summary
When looking to open a bank account in Thailand with a non-immigrant O retirement visa, many expats recommend Kasikorn Bank as a good option. It is important to note that you can only open an account after you have entered the country on a retirement visa. Being prepared with the necessary documents and presenting yourself in a respectful manner can facilitate the account opening process.
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The people who show up at the bank prepared with the proper documents, conservative clothing, and polite calm, can get it done at the 1st bank you walk in.
Your wording is weird: you cannot get a Thai bank account opened FOR the application to a retirement visa. You can only get a Thai bank account opened when you already have entered ON a retirement visa.