[PsychoAnalytical]

Cai is interesting and not that common (I personally haven't heard it before), but Skylar seems to have a fuller sound to it (and by 'full' I mean more complete, as opposed to the shortness of Cai). My verdict is it depends on what you want/what you prefer. If you want something more substaintial, I say "Skylar." If ya like it short Cai is good.