Should I apply for a Non-O visa before moving to Thailand or wait until I arrive?

The discussion centers around whether to obtain a Non-O visa prior to arriving in Thailand or to wait until after arriving. It is mentioned that having a Non-O visa before departure makes for an easier transition in Thailand, particularly for opening bank accounts and extending the visa. Applying online can eliminate the need for a return ticket, although airlines may request proof of onward travel. While some travelers report using a one-way ticket without issues, others suggest preparing an onward flight to avoid complications with the airline.