I try to avoid using the big rig pump areas as they are usually very dirty, somewhat confusing as to where exactly to pull in and pump from, and I don't feel comfortable having my family & dogs getting out in those areas. Don't care that they don't have pay at pump though because most places cut me off at $100 if I use my card, and I don't like having to go through the entire process twice. I just pump once and pay inside.
Kwik Trips are my diesel station of choice. They always have one large hi-flow nozzle and one regular car type diesel nozzle at every diesel pump. Clean and friendly place with good prices and nice stores.