I'm kind of surprised by the answers even with a small sample size. I thought there was a wider variety of how people like their deli meat sliced.
To me, visually, they all look good except 3rd from left.
Bentley, the 1st from left is actually the only one that is not rye. It was a sub bun. From the video, it was the only non traditional one. Fish sauce in the brine, thick slice, fresh dill instead of pickle, etc. All of them are allegedly highly respected in NY.
Left- Harry and Ida's
2nd- Katz's
3rd- David's brisket house
4th- 2nd Ave deli.