Neither. The QX is hideous and the third row in the X5 is a joke.
There is only one good choice in this segment and that's the Mercedes GL.
2011 X5 xDrive 35d Red/Black: ZCW, ZPP, ZRC, ZTP, 300, 386, 496, 4AB, 6FL, Combox, LED Coronas. 04/11 Production