Juliana looks more intuitive in terms of pronunciation. People around here aren't very good with unfamiliar names* and I think people would be stumped by
Giuliana and pronounce it "goo-lee-anna" or something!
*I know kid with names like
Aida and
Katerina whose names are pronounced wrong all the time!
**
Emma**
http://www.behindthename.com/pnl/54547
Favourites:
Eve,
Alice,
Norah,
Isla //
George,
Charlie,
Arthur,
Oscar