Based on pics alone, I'd say the X6 is more masculine and has more "presence", while the X is more elegant and sleek. As I said before the reveal, from the outline I suspected the X6 and Model X would be somewhat similar, and they sort of are.
If they're going after soccer moms and the minivan crowd, no need to get more aggressive on looks IMO -- though, I wouldn't mind. I still remember that Model S designer mockup that was very aggressive. I liked it mucho.
*edit* here it is -- I suppose this would make a decent Roadster 3.0 or bluestar performance.
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