You may wanna keep in mind, Katz is good, but they cut the meat really thick, almost "hunky". Its different then the typical "thin slice" method. But still worlds better then Carnegie in my humble opinion.....
Now there's a reliable source! Ok, Bonniebelle, you're going to have to decide whether to rely on the collective wisdom of the Hounds, or on the USA Today. Your choice.
Thirded on Katz's. Their pastrami is killer - my husband and I typically share one sandwich between the 2 of us! We pair it with a knish and some Dr Brown's soda and mmmmmmm. :)
I nearly forgot! If you eat at Katz's, tip the guy making your sandwich. He'll give you a nice slab of pastrami to nibble on while you wait for him to finish his work.