What is the easiest visa option for an Australian retiree visiting Thailand annually with a Thai spouse?

An Australian citizen married to a Thai national, who wishes to visit Thailand annually for up to six months, may consider a few visa options. The easiest option could be the NON-O visa, which is specifically designed for foreigners married to Thai citizens, offering longer stays and multiple entries. This visa would allow hassle-free visits to Thailand, especially since the spouse owns property in Chanthaburi.