Flown them both, so here it goes.
320. You stroll onto the flight deck,and gently slip your kit and bag into place. You sit down, pull out the tray, and spread out the release. You reach over, plug the box, and then get up, stretch, talk to a few passengers, get yourself a drink. Low workload from taxi through landing, no leaks, and sun visors which work really well. The toughest thing you do is remember when to turn on/off the yellow electric hyd. pump! Don't get high and fast though, cause it's slippery.
M88. You contort yourself into the seat and nearly dislocate your shoulder trying to get your bag into place. There is hardly anywhere except on top of your open bag to set anything, which is where your Jepps lies, though unless you're 20/15 good luck reading it unless you bend down. The box is fine, some take a bit of time to process though. The preflight inside will have you yearning for the days of flight engineers when you could pawn that crap off on someone else. Bend over the yolk, and you can see the nav. display, and get used to doing this all day. Be sure to stretch before you try the engine start, you'll need both hands. Try to recall which airports have really bumpy taxiways, because holding onto the start switch on the delayed start (fDAL) during summer can be tough with a captain who taxies at any kind of good clip. Pretty decent plane in flight, although it's a two-handed autopilot and you have to watch the altitude being armed on the FMA, which have been known to disappear. Easy airplane to slow down, you'll drop like a rock with 210/flaps 23/gear. There is no sexiness factor on this airplane, but I like flying it regardless of all I've said. Previous writer was correct though, nothing beats the 757!