What are the main differences between visa extension of stay based on marriage to a Thai national and dependency in Thailand?

Conversely, if you don't wanna do that you could hoof it over to the thai consulate in Savannakhet Lao, Ho Chi Minh City Vietnam or Seoul South Korea and get a year-long multi-entry Non-O visa based on marriage without ANY proof of funds and only minimal documentation. True on that type of visa you'd have to exit/re-enter the country every 90 days but you could get 15 months of stay out of the visa itself.

Okay, despite what you were told, there is NO rule that you need to have a yellow house book to get a yearly extension based on marriage at the Hua Hin immigration office. I just called a friend who lives there and who gets his yearly extension based on marriage to a thai national down there and he said it is NOT required. He did need the thai house book listing of his thai wife (who was NOT born in Hua Hin BTW) and he did need copies of his lease, the land lords thai i/d and the house book listing on the property he rents down there as well as the required photos and documentation needed for the marriage extension of stay.

You can get a hand out of what's from them at the Queenz Park immigration office down there as far as what documentation is needed for a marriage extension

You do not need a yellow book for an Extension of Stay.

the financials for marriage to a thai are 400K baht banked for 2 months or a letter from your consulate stating you get 40K baht a month in income from abroad,

the financials for raising half thai kids are the same money banked BUT there is no seasoning requirement

the financials for raising 100% foreign children are 500K baht banked for 3 months except the first yearly extension the money has to be banked for only 30 days. There is NO provision to use an income affidavit from your consulate

one is based on marriage to a thai national and the other is based on either marriage to a foreigner legally working here OR raising a half thai or full foreign born child.