Xenoblade Chronicles vs Xenoblade Chronicles X

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I preferred the original for its more interesting plot and more consistently great soundtrack, but gameplay wise they're about equal; XCX added Skells and deeper customization to the mix, but XBC has the fantastic "change the future" mechanic where you foresee enemy blows and have to figure out how to stop them.

Both are awesome games, and bring a welcome diversity to Nintendo's first party catalogue.