Sorry, I'm a tonight, but the company here is always great. Based on a friend's comments who has owned both (X5 4.4 and Pepper S) for several years (one before the other), the X is more fun to drive below 100, the S above. The brakes have better feel on the X, but look better on the S. I just hate him for being liquid enough to own both. (Not considering his 996 turbo in his garage which just pisses me off..)

Personally, considering both looks and driveability, I would go with the X.

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2005 ///M3 Competition / Interlagos Blue-Black /6spd/SS Race Exhaust/Angel Eyes/Passport HW/Mich. Super Sports Soles (love em)
2008 ///M3 Melb Red w/ Beige Novillo, Tech, Prem, & 19" (Retired)
2005 X5 4.4i Estoril/Grey Sport, Nav, DSP, Prem, Pano, etc. (Wifey's)
2007 335i Silver/Black SP,PP,CWP, Comfort access, & Sirius (Retired)
2001 X5 3.0i (Retired) Silver/Gray Sport w/19"/Prem/DSP/CWP
2002 YZF600R (Retired)