This is a proposed poll submission; here are the options I suggest:
*Parallel to floor and wall; dispensed from front
*Parallel to floor and wall; dispensed from back
*Parallel to wall, perpendicular to floor; dispensed from side closest to toilet
*Parallel to wall, perpendicular to floor; dispensed from side furthest from toilet
*Perpendicular to wall; dispensed from side closest to toilet
*Perpendicular to wall; dispensed from side furthest from toilet
*Other
Request: after voting, explain why yours is the best choice
I hear people complain about TP being hung the "wrong" way all the time, and seldom hear cogent arguments about why their way is right. Usually, the explanation is "that's how my parents did it".