For me the '75 was always the best. Not flown the 321 but my fellow 'bus drivers have and do. No power, kept down low in the 30's in the weather. Hot brakes, poor field length performance. And then the '75, ok burns a load of gas, but!! Shed loads of power, great handling, no going south in ACE cause of obsticle limits for the airbus clan. Can do a 6 hour sector, full pax, regardless of temp (ish) Bravo bravo for my old love!!
Times are a changing though, not the type to have when gas is at record levels. Did I just say that?? Bugger....