Hello :)
I think I prefer
Luigia. I'm not sure how well it would work outside of Italy, but I like it. It has a lot of energy and it's strong. I love
Luigina, it's so cute.
Luisa is fine, it's more international. What I don't like about it is that it seems like a compromise name. Kind of like
Helena. I have the feeling that everyone kind of likes these two and that they are often used when the parents can't agree on anything else.
Luisa is super commom here in Austria, in
France it's
Louise. For some reason
Louise has more character to me.