You're all wrong and getting far too technical about it! I work on, (notice the work on, not fly!) the 737, A319 and the 777. Ignoring the 777, the basic differences between the 73 and the 319 are obvious. The 73 comes complete with fluffy dice, a pine tree air freshener and go faster stripes, whereas the Airbus has a tartan rug and a box of tissues on the back parcel shelf and a round tin of travel sweets in the flight deck! The Airbus is the Rover 416 while the 737 is a Mark II Ford Fiesta XR2i! See, it's easy when you don't get technical!
I'll get my coat.....
JSL