To be honest, i'd choose the front end. You can see when mates are visiting so you can run down and let them in, when it's sunny (or Sallies Day) it's nice to see everyone out on the grass, also you can see everyone getting water chucked over them after graduation, and you can see the Quad clock if you can't find your watch

Plus, the back end is where deliveries come in and other than the sea there's not much else to see.
EDIT: Also, if you forget/lose your card, someone can chuck it out their window for you, and the back rooms tend to be smaller... Can you really specify where in the building you stay??