Consider any after market modifications between the two.

Personally .. I would go for the 2010 one ... although 30,000 sounds a little high, I'd push them to drop it a little, unless its in perfect condition. Reason being its been on the road for 2 years less, the closer to 100,000 the higher chance of having to replace more parts on it, once again that can vary as to what the service history is like.

Also as stated above, the 09+ models include LSD.