I've had a lot of great sandwiches in the Burgh. Szmidt's, Peppi's and primanti's, they all put out a great product. But the Best Sandwich that I have had in Pittsburgh?? The Reuben at Big Jims in the Run, Greenfield. Sooo spectacular!!! Perfect in every way. I haven't eaten at Gaucha Parilla Argentina yet, so I won't call it the best in the Burgh. But it is the best so far.