Uncle Sam's is a local institution, so I'll always be loyal. I try to make it to the original Shea/32nd St. store whenever possible, though. The Scottsdale store often makes me feel taken advantage of.
See, the thing about Uncle Sam's is that it started out as a kind-of hangout for high schoolers. Which explains the haphazard atmosphere, service and menu. But the food was great and service was efficient and friendly; so the kids just kept coming over the years and now have gotten their kids and grandkids on board. All the good stuff is pretty much still there at the original location.
The casual attitude often turns into neglect at the Scottsdale store, though. Resulting in sloooooow service, no refills and food that's cold by the time it gets to you. So unless I'm right nearby, I usually steer toward the 32nd St. location when that cheese steak craving hits.