MD was bought out by Boeing in 1997 - if the 320 designation is accurate, it was built by Airbus.
Having flown both Boeing and Airbus aircraft purposely on several 2-leg cross country flights, I was able to make a comparison. The aircraft involved were 757-200, 737-800, A319, A320, and a 777. The 777 was the best airplane, hands down (except for the boarding time for 300+ people). Comfortable, quiet, in seat video, lots of stowbin room. The 757-200, being the oldest airplane, had normal wear in the interior but was ok to fly in. The 737-800 was my second favorite with large stowbins (for a single aisle), nice seats and a solid feel. Both the 737 and A320/319's were slow compared to the 57 and 777. The A320 was ok with slightly smaller stobins and in seat video. It shook like a rattle trap on takeoff with the stowbins and supports moving out of sync with the floor mounted monuments (galleys, lavs). It was like looking at two tubes moving in opposite directions. The flight and the landing were smooth. The A319 was nearly new and very clean. The seat cushions still had some give unlike old matted-down seats.
There were obvious design differences but to the average passenger, you'd be hard pressed to tell the difference from inside the airplane. That is, unless you fly a lot or you work for Boeing, like I do (or Airbus). You have to remember that the airline has nearly all of the responsibility for the way the passenger cabin looks, not the airplane manufacturer. With all that said, I absolutely prefer Boeing if for nothing more than I like a nice robust structure around me when I fly. I didn't get that feeling with the Airbus airplanes.
MiG