BMW X5 M or BMW X6 M?

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What do you think?

i love the X6M that car looks sweet! ever since i saw an X6 in person i have become a huge fan of the cars styling.

these cars are great but i wish the M division concentrated on making a super sports car to compete with the audi r8 instead of these, or even an e90/92/93 m3 csl would have been nice to have as well