What is the best visa option for a foreigner married to a Thai citizen looking to move to Thailand?

For foreigners with a Thai spouse, the recommended visa is a Non-Immigrant O Visa based on marriage. It can be obtained at a local Thai embassy, which will provide a list of required documents. Initial approval is usually for three months, after which you can apply for a one-year extension. It's crucial to register your marriage in Thailand to obtain the necessary documentation (Kor 22) for the one-year visa. Additionally, if you have a child with a Thai birth certificate, you may qualify for a visa extension under certain conditions. Be advised to check specific immigration requirements in your area.