I never thought i'd say this
A 320 is a nicer machine to operate day to day. I flew and loved the 737 in both seats and it would still be the machine for operations in limited environments, lack of ground support etc. but the 320 is the "next generation" literally.
My only caveat is, a very windy day. The 320 leaves you "disconnected", in terms of "feel". That's what i would miss most about the 73', the stick gave you the feel in your hand of what the machine is doing. In the Airbus you must rely on your eye, either reading the instruments(PFD is wonderful) or looking out the window.However the 'Bus is still quite capable, even on the strong wind days, you just have to have a little faith. The problem is you can sometimes hit the "stop" on the sidestick but the flight control may not have reached it's limit yet,it can be disconcerting but you have to give it that fraction of a second to see if your getting the desired response, say, in the flare, rubbing the nose around and trying to get the wing down into wind.The rudder gives wonderful natural response like the 73, it's just the aileron/spoiler response that lacks the natural feel of the 73'.