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I'm planning to buy X, get familiar with the game, and if I really like it, buy Y at a later time.
I want X to be my main game because I think Xerneas just looks plain awesome. Aside from that though, it's clear that X and Y are the opposing concepts of life and death. Y and Yveltal symbolizing the concepts of death and destruction while X and Xerneas are birth and creation. X also has more 'friendly' looking version exclusives, while Y has more darker and grim ones so far.
I'm more fond of the aura and atmosphere of X over Y.