I miss Carnegie's. They closed their restaurants, but they still sell their famous pastrami and corned beef to the public and a few restaurants (though I haven't found any).
As for pastrami vs corned beef, at Carnegie's you didn't have to choose. The "Woody Allen" was one of their top sellers with half and half pastrami and corned beef. Here in San Diego, good pastrami (or even a really good deli) is almost impossible to find. And nobody here stacks the meat up like the NY style delis. You get 5 or 6 oz of meat instead of north of a pound. At least in NY, that $20 sandwich is good for two or three meals.
A few years ago, I heard there were a few Carnegie vendors at sports venues. Not sure where, or whether they were the real McCoy. Agree, the $20 sandwich was a deal in NYC.
Milton’s up in Del Mar is worth a try.