The T2-T3 transfer really isn't the end of the world. When I missed a DL flight last year, I rode the bus ~4 times (it works).

That having been said, T2 (old) really is better than T3 (new). A single decent restaurant in T3 (air side) could tip the scales in favor of it, but the current situation is pretty sucky (and the lounges don't help much).

Due to my *G hitch, I still use T3 often (for the lounge access and the extra baggage allowance), but I'm not so fond of the long walks.

T2 really is better.