While at my local dealership for some maintenance on my 2009 MDX, I was able to test drive a new RDX AWD back to back with a new MDX AWD. Size aside, I came away preferring the RDX. IMHO, it seemed much sportier than the MDX (more like my 2009), and had more current tech. I was not able to drive the MDX Sport Hybrid, but if 3 rows were not necessary, I would opt for the RDX. My only regret is that there is no V-6 performance option for the RDX.