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Not going to be biased but lets look at some pros and cons that are obvious:
X6 Pros: Looks better, more roomy, more power, better fit and finish, 6 vs a 4 model.
X6 Cons: More fuel, 13 model vs. 15 model.
X4 Pros: Probably more nimble as it is smaller, newer style, better on fuel.
X4 Cons: I sat in one and found a lot of the materials are cheap, biggest engine is the 35i.
There are probably more I can think of but it comes down to preference, fuel, and size that would make the decision here.
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