I would take 320 any day of the week except in my case where the 737 pays more money and does better trips. The 737 cockpit feels smaller to me than any jet I've ever flow, DC-9, MD-80, 320, EMB-145. I think it has to do with the side window being so close to my head and the CB panel being so close to my seat. 737 next gen has much better avionics than 320 which makes it a little more complicated to fly. 320 is easy, quiet, and comfortable. When it's all said and done, they all go up, they all go down. A plane's a plane.