There are many variables that help me decide which type of plane I prefer. Also, a lot is influenced by my regular airline partners, Alaska, Northwest and United.
SHORT HAUL COACH: DC9/MD80 Especially if I am with my wife as we select to sit on the two seat side and not have to deal with another passenger in aour "personal space".
LONG HAUL COACH: A320 The extra width of cabin size makes a difference ove other narrow body planes.
SHORT HAUL FIRST: ANY WIDEBODY Heck, if it's under 3 or 4 hours, I just want to be comfortable and with a larger plane, there is more chance for me to upgrade.
LONG HAUL FIRST: 747 (UPSTAIRS) Much quieter, less human body odor and those side bins are great!