Need more info on packages on each, are they from a BMW dealer or not, do they have CPO or not, etc. I would be more concerned with the condition, options and where the car was driven (Rust Belt or mild climate) than how many miles are left on the warranty.

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2008 X5 4.8
Jet Black/Black Nevada/Dark Burl Walnut
Adaptive Drive
Premium Pack
Tech Pack
Climate Pack
Sport Pack
20" Wheel Option
Premium Sound
Sirius Satellite
Rear DVD Entertainment
Multi-Contour Seats
Comfort Access
3rd Row Seat
Heated Front Seats
Running Boards
3M VentureShield Paint Protection Film