i miss the more nimble handling of the XJ sometimes, the rear leafs (and only ~4" lift that i had) made it more fun to haul *** on forest roads and pitch it around the corners.... the WJ rolls around corners after the 6" lift like a boat on the high seas!
other than that - i love the WJ! the V8, a little more room, the V8, more towing capacity, much nicer interior, the V8, the heated seats, the pretty decent soundsystem, and mainly not having my right leg cramp up due to that damn wide hump in the middle (i'm tall)... oh and the V8
overall it's just a different level of vehicle, but everything costs twice as much for it and there is half the aftermarket stuff even made for it... so again, not apples to oranges at all. best i can describe is if you've ever driven a base TJ and then driven a limited XJ... the WJ is like that sort of up-step in many areas, but even much more disconnected from the trail.