I prefer
Maude to
Maud because it looks more complete to me. I don't know if one spelling is older. They're both dated in the US, but I like them anyway.
My favorite versions of
Matilda /
Mathilde /
Matilde are pronounced with a 'teel' instead of a 'til' sound. I also like
Matild.
Where I live, though, out of all of those,
Matilda (pronounced mə-TIL-də) is the version that would fit in best.