No major changes to the '06 (unless you think turn signals on the side mirrors is a big change). I believe the engine, transmission, AWD set-up, etc are identical, as is the styling. The similarity in price, mileage, etc is a wash. The difference that would be important to me is the maintenance. It sounds obvious but is probably the most important factor here. Check to see if either has a recorded service history. Also, have an experienced independent mechanic do a pre-purchase inspection and walk-away from a seller who will not let you take the car for this task. Good luck.
'05 XC70 (family truckster)
'11 X3 xdrive35i (Daddy's daily)
'05 Sienna XLE Limited AWD (the road tripper)
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