Did not really consider the X4. I have a 90 lb dog that frequently rides in the back for a couple hour drive to the mountains and I did not think the tapered back would allow much headroom for him. X3 is perfect. slightly smaller in back but still plenty of room. I also cycle a lot and have no problem getting my bike and gear in back with the seats down.

Best of all though the X3 is just so much fun to drive versus the X5. My 2012 X5 was fast but not nimble. This thing is both. Let the soccer mom's drive the new X5, I will take this any day.