I don't know about the USA but here are the best we have tried
RANK
NAME
LOCATION
RECOMMENDATION
1 Harold's Deli Edison, NJ or NY, NY Knish or Rye Rueben
2 *Tony Luke’s
Philadelphia, PA
Chicken, Veal or Pork –Italiano
3 *Johnny Hots
Philadelphia, PA
Hot Sausage, cheese, mustard
4 *Nicks Old Original
South Philly, PA
Any Roast Beef sandwich
5 John’s Roast Pork
Philadelphia, PA
Roast Pork
6 Callaway’s
Huntington Valley, PA
1/2lb BLT
7 Jimmy Johns State College, PA J.J. Gargantuan
8 Sandy’s Beef and Ale
Langhorne, PA
Roast Beef
9 Little Nicky’s
Philadelphia, PA
Any of the “Fat” sandwiches
10 McNally’s
Philadelphia, PA
Schmitter
11 McGowans Sea Isle City, NJ Junk Yard Dog (Originally from Pat Sandwiches from Sea Isle)
12 Uncle Bill's Country Market Levittown, PA Fried Liverwurst, onions, spicy mustard.
13 Meglio Newtown, PA Meatball Parm
14 Mineola Diner Mineola, NY Pastrami / Portugese Bakery Roll
15 Altomonte’s Italian Market
Warminster, PA
Any
16 Papa's Pizza Trevose, PA Sausage Parm with Mayo. (The Staywich)
17 Are U Hungry State College, PA Any of the "Fat" Sandwiches
18 Kelly's Revere, MA Roast Beef
19 Philly Style Levittown, PA Pork Roll and Cheese Pretzel
20 Ishkabibbles Philadelphia, PA Chicken Cheesesteak
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Tony Luke’s The buster is good also as just about anything is there as well. What makes a sandwich “Italiano” is the addition of broccoli rabe (pronounced rob) and garlic.
Johnny Hots – Open limited hours. Make sure you check their website before going down. If they are closed, just head down the street another 15 minutes and hit Tony Luke’s.
Nicks Old Original Roast Beef – 2149 South 20th St, Philadelphia, PA. Not open on Sundays.
Tony