I came out face up. To this day my mom says that giving birth to me was the most pain she has ever felt.
The back labor was tough (especially since back then they insisted that we lie on our backs with a fetal heart monitor strapped to our bellies) but it was more the fact that it's easier for the baby to arch its back than to tuck its chin to go through the birth canal, so it took longer. My son had a major conehead going on by the time he arrived.