I like them both. I don't understand why they aren't more common, especially
Louisa.
Louisa should be near the top 100 by now yet it isn't even in the top 1000.
I'd like
Louise, but I hear people saying it loo-WEEZ a lot and I hate that. I only like it as loo-EEZ.
I prefer
Louisa. I don't mind
Lou and
Lulu, but I would only call her by her full name anyway.
I also really like
Luana.