Wasn't expecting Nintendo & Game Freak to already be tossing out Gen 7! I'm still not really done with Gen 6 yet. =/
Anyway, My sibling and I generally base our selection on the "box Legendaries," which haven't been revealed yet, so I can't say which version I'd get.
Still, going by just the titles, as a "night person" I'd probably go for Moon.
Now that I stop to think about it, Nintendo's/Game Freak's choice of calling Gen 7 Pokemon Sun & Moon is a little ironic considering that one of the many Pokemon clones to flood the GB/GBC/GBA after the success of Pokemon, Robopon, also had versions called Robopon Sun & Moon.
There also a third game in the Robopon series called Star, so the only way this could get any worse is if Pokemon make a third later game called Star. Xp
Also, most fans believe that the Flying type that was "partially" revealed will likely be a woodpecker, which is great since that's one of the animals I've been wanting them to make into a Pokemon for years (I even sketched my own idea of one--a Flying/Steel type--years ago).
Here's a drawing someone made based on what little has been revealed on its appearance: 36.media.tumblr.com/90900ea5af9e0d6cba47a299bde681d8/tumblr_o35w6d0hTV1skoy7ho3_500.jpg