Corner seating at Autzen Stadium is a wildly different experience, depending on which side of the field you're on. If ticket prices are equal, you'll want to experience the game from the south side instead of north sections 3, 5, 17 and 18.
First, the south side of the stadium features multiple access points to the concourse. This limits your walk up and down stairs as you enter and exit the seating area. On the north side there is only a single access point at the top of the section. If you paid an arm and a leg for a ticket in one of the lower rows, it may cost you your remaining leg walking up and down the stairs each time you need to use the restroom (which are located only near midfield on the north side, but also in the corner on the south side).
Another reason to prefer the south side is that the sun will set behind Sections 37 and 38 - or in other words, it will set directly in the eyes of Sections 17 and 18.
Given their undesirable location, sections 4 and 5 are typically reserved for Oregon students.