I don't even watch star wars, but I think I'll go with Leia. I just love the pronounciation better. :)
As a Leah, I feel particularly invested in this thread. Yes, the LAY-uh pronunciation has gotten me a lifetime of Star Wars comments; no, that has never bothered me. I actually like the association. Leia is a badass. I definitely prefer LAY-uh to LEE-uh, though I'm admittedly biased. From what I've been told, LAY-uh is the Hebrew pronunciation of Leah, and, probably not coincidentally, all of the other Leahs-pronounced-LAYuh that I've met have been Jewish.
I don't know if popularity is a consideration, but LAYuh is considerably rarer than LEEuh, in my experience. However, bear in mind that the 'lay' and 'lee' sounds are very popular: I've been in many situations where there's at least one Lia, an Aaliyah, a Lila, and a Layla. Since all of these names are shooting up the charts in various configurations, I would emphasize even more the importance of a phonetic spelling. I really can't overstate how frustrating it's been to constantly correct people on how to say my name, and I'm sure it will be even more of a trial for a kid in a classroom full of sound-alikes. That said, I do love my name!