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I like both. I know a few Julias but I've never met a Fiona.
I think YOO-lee-ah is a lot less dated then JOO-lee-uh. I don't like JOO-lee-ah is all really that dated, but if I wanted it to sound fresher and definitly not dated, I'd go with the prn. you gave.
If I had to use them I'd use Fiona Guinevere /Fiona Gwendolen and Julia Siobhan / Julia Rosalind.
I also think they make good sister names...