Are both X and Y worth getting?

[Colour Bandit]

I'm only getting both because my brother was going to cancel his Y pre-order from GAME, so I paid him for the pre-order and he still gets all his GAME reward points. If he hadn't decided to cancel his pre-order we would have traded between each other.

Though I'm glad I'm getting both as I can have one permanent save and one copy for Nuzlockes and other challenges, but again that's just me personally.