Jimmy Johns is the home of free smells and they are finally in the Phoenix area with 3 stores that I know of - Downtown Tempe on Mill, Rural and Baseline next to Whole Foods and Rural-ish and Ellitot-ish.
They keep it very simple at JJ's using fresh meats, cheeses, and fresh daily bread. The bread makes the whole sandwich as it is a great mix of crispy outside and chewy inside.
I go for the #6 - Veggie Sub. It has Fresh (actually red which you don't see at most fast sandwich/sub shops) Tomatoes, Provolone, Cucumbers, Sprouts, Avocado Spread and Helman's Mayo. That's right they use real mayo, which is a little fatty, but worth the calories at the end of the day.
I like that there is not any fussing over the size of sandwich - either a sub that is plenty big or you can go with a sandwich on wheat bread.
Quick, simple, free smells, and dependable.