I looked at '09's and 10's before finding the deal I got on my new '11. I seem to recall that there are some minor differences in the styling that changed in '10, but unless you notice and care, I wouldn't think that's an issue. The other differenc I seem to recall is that there are clips that hold the 3rd row seatbelts up to the side of the rear compartment on the '10 models, but not on the '09 (or at least the ones I checked out). This is a big deal fo rme because I use the are tonneau cover a lot, and the 3rd row belts can catch on it if they are not out of the way. As for adaptive dirve, I'd strongly recommend it if you can find a car with it for the right price. It's a costly option standalone, which is probably why it was unbundled. However, it really counteracts body lean when compared to car without it. I drive up to the mountains frequently on a highway with long sweepers and lots of hairpins and gades with a pretty full payload. It really makes a difference for me.

I hope this helps.

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Current Fleet:
2018 328d Xdrive Sport Wagon
2011 X5 Xdrive 35d
1973 2002 tii
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Past loves:
2015 i3 REX
2011 535i Xdrive
2005 X5 4.4i
2003 530i
1999 528i
1995 525i