Corner sections are among the cheapest ways to sit in the lower level for a Sixers game. If you are considering seats in these sections, you'll want to avoid all rows through 10 in sections 104, 110, 116 and 122. The sightlines from these lower rows are very poor for a basketball game. Instead, consider sitting in a higher row in one of those sections or in one of the adjacent corner sections.
Corner sections 105, 109, 117 and 121 don't have the best sightlines, but they are better than other corner sections. Sitting in a higher row helps cut down on the poor angles and makes seeing the entire court more comfortable.
As with all lower level seating, the section tunnel is located at row 17. Sitting in or near this row will make it easy for you to enjoy all the concourse amenities without climbing too many stairs.