3rd Floor Jester East - Once I found out that the football players didn't get breakfast in their special dining hall (only lunch & dinner was served in the football players' dining hall - no breakfast) and had awesome breakfasts served to them in the 2nd floor of the Jester dining hall, I ate breakfast in 2nd Floor in Jester, and never had breakfast anywhere else again.
The burger patties in the Andrews dining hall were freshly flame-broiled (and not put in the cold, brown, unknown liquid that Jester & Kinsolving put them in--- ugh), so unless I felt like getting a baked potato from Kinsolving's dining hall, I usually ate lunch/dinner in Andrews.
I knew about Andrews' dining hall because in the mid-60s while attending The University, Dad used to work as a cook in Andrews dining hall. He loved it; it allowed him to park on campus every day. He still tells me about things that the girls did to the eggs he'd make that was even worse than dumping ketchup on them. Lulz.
I never tried Simkins' cafeteria, but I ate Saigon Eggrolls a ton, from any of the locations: 24th & Speedway (or sometimes over by Littlefield Fountain), 26th & Speedway, or on The Drag near The Co-Op.
I miss Saigon Eggrolls!