Vietnam mentions a 3 to 7 day timespan to handle and deliver the visa for 90 days with no asking for unnecessary support documents.
Thai Consulates mention 1 month processing time, that can be more if a zealous consulate employee wakes up one morning and decides to ask for some more support documents via the e-visa application.
In other words, wealthy retirees and tourists looking for long stay in winter will obviously choose Vietnam. Far cheaper and nore farang friendy maybe ?