Which fucking game should I get US or UM?

I was at the store yesterday trying to decide for 30 minutes and got so mad I left without either game.

I played Moon originally, never played Sun.

So of course I wanted UM but I got to looking and I really like the US box art (thats why im a buyfag) so now I'm not sure which ones to get.

I've looked at the exclusive pokemon for both and can't seem to decide.

Someone please swing me towards one or the other game, I'm going back to the store today.