Right now just because of the box art, I'm going to go with OR because it looks like there's magma (lava) coursing through Groudon, but I'm going to wait, in case of Version exclusives, and whether or not the Box Art Groudon and Kyogre are Megas, and the typing if they are; that's what I did with X/Y and ended up getting Y, so I'll use the same approach here too.