What is the best visa for my husband to move to Thailand based on our marriage?

Different options. 1) apply for the 1 year Non Immigrant O visa based on being married to a Thai National, on entry he get 90 days of stay and than he must do a border run to get a new 90 days of stay. 2) Apply for the Single Entry Non Immigrant O Visa based on married with a Thai, on entry he get 90 days of stay. Open a bank account on his name, deposit minimum 400.000 Thb into this account and after 60 days of stay he can apply for 1 year Extension of Stay at local Immigration Office. Before that year ends, he just apply again.

He can apply single entry Non-O based on marriage to Thai national before leaving home country, and can apply 1 year extension based on same reason at immigration office when he is in Thailand, if meets the requirements for both time since requirements are different when apply visa at consulate and apply extension at immigration office inside country,

Getting a Non-O Multiple Entry (Non-O ME) based on marriage would be best, but there is one big catch:

Your husband's Amazon business.

Legally, you can not work without a work permit in Thailand, and you can not get a work permit working online.

I also don't know how long those Non-O Multiple Entry based on marriage will continue. As of now, there are only two places that offer them to my knowledge:

1. Savankhiet, Loas

2. Hochiminh City, Vietnam

So it is something to keep in mind and think about.

EDIT: These two cities don't require the proof of income or seasoned money. Non-O ME based on marriage can be found in other places, and if you can prove the income or the funds, you can go elsewhere.

He should go to a Thai consulate in the US and apply for the multiple entry none o visa based on married to Thai. That'll give him one year then after that get the same visa outside of Thailand such as Laos. This is what I do.