Black 2 was technically the last I played, specifically my file has just beated Clay and is still in Driftveil City.
But if I'm not locked to specifically where I was in the game:
I'd definitely start out in Aspertia City, and my starter would be (if I'm locked to Unova), Tepig! I'm not the world's biggest fan of the Unova starters, but Tepig strikes the balance of cute/cool nicely, and even though Emboar is too slow for my liking, it's still a pretty badass design.
I loved the new starting area of Aspertia/Flocessy/Virbank that B2W2 provided. Somehow, it all made me feel the same way GSC made me feel starting out. Maybe it was just so nice to see a little Mareep ranch, maybe the novelty of getting Riolu at the start of a game was stronger than I realised, but everything just fit together nicely for a fresh opening, before we returned to the familiarity of Unova in Castelia City.