I prefer the a320. Clean design, pilot friendly, no goofy knobs, switches, levers, etc all over the place. Bag storage is huge, being able to move your seat to something comfortable in cruise is nice, not worry about the CBs behind the FO, two jump seaters fit nicely with plenty of room for everyone and their bags, no crazy shuffle and uncomfortable positions when swapping with a FA or jumpseater to use the LAV.

The side stick is something you get used to, once you learn and actually understand the systems, the Airbus is very nice. It took me a while to get over not have a yoke and have the tactile/visual cue as to what is going on with the controls when the other guy is flying, but when you get to this level in the states, it is much less of a worry than say if someone was in the ME or Asia etc.
Plus...when it comes to meal time, you have a pull out tray and you can cross your legs, move them around, not worry about getting your knee whacked by the yoke, not have a super high speed crazy trim wheel crush your knee, the bus auto trims itself.

The bus does make you more complacent unless you make an effort to turn everything off and actually fly the plane. Even then, no trim and it commands rates, so you just stick it and leave it really.
A better understand of the computer systems is required IMO.

Only going to 39000 is a downside, 410 is useful for weather, but not that big of a deal. Longer legs so less worry of the tail and wingtip strikes like the 737-super.

Id say more passengers and dead headers find the Airbus more comfortable in the back. Except when people don't turn on the yellow electric pump with #1 running...that PTU is annoying back there.