Is it easier to extend a Non-Immigrant Visa based on supporting a Thai child compared to a marriage extension in Thailand?

Jonathan Pressburger posted

i wondering whether an extension of a one year non-immigrant visa based on supporting a Thai child (mine) is easier or more advantageous re income or money in bank requirement than an extension based on marriage (not the mother)?

16 yrs plus extensions based on retirement but now UK embassy fail to provide income letter...which has fewer hoops to jump through?

I know about marriage requirements but can't find about that based on a dependent child here. Financial the same? Thank you