What is the best visa option for a Canadian and American planning a stay in Thailand and Vietnam?

The user, a Canadian with an American husband, is planning a two-month stay in Thailand followed by three weeks in Vietnam, then returning to Thailand for another three weeks. They mention a belief that as of October 1, they can obtain a 45-day visa on arrival, which can be extended for an additional 30 days. The comments confirm this information, advising that the extension costs 1900 baht and suggesting the need for a flexible return flight ticket due to airline requirements.