I've never been a big fan of
Ruth, I don't really know why. It just seems bland to me.
I really like
Mabel. I don't think I'd ever use it, but it is cute and very "Southern" to me.
Falene is okay, I feel like I've heard it used before somewhere, but I can't remember where. I don't really like the way it looks. It does seem like it would be kind of dated, since it reminds me of
Marlene,
Darlene, etc.