As you face the field of play, seat 1 will be on the right aisle. While having the aisle in seat 1 is appealing to most, seat 15 will be slightly closer to midfield. Seat 15 will; however, be near the middle of the row.
Lower level sideline seats are home to some of the best seats in the stadium with their close proximity to the field and ability to see all the action. The sections clustered around the 50 yard line are particularly good because of their prime location in an ideal spot.
While the most expensive tickets might be closest to the field, the best views will be found in rows 20-40. These seats provide the best elevation for seeing the entire field comfortably.
Sections 109, 110, and 111 on the NE side are designated student sections. These areas are likely to be some of the loudest and rowdiest in the whole stadium.
The biggest complaint about lower level seating (besides for all bench seating) is lack of access to the concourse. With 60 rows in each section, you may be a dozen feet from the field but more than five-dozen steps away from grabbing that ice cold drink or relieving yourself.
Section 128 has a good view. I would recommend being row 12 or higher though. The top 8 or 9 rows get shelter from the rain. This entire half of the stadium is in the shade on the late summer days.