As a native New Yorker, I should have some loyalty to Nathan’s (Sabrett is better), but locally (in this office), I think you’ll find that the Roast Grill-Hot Weiners is by far the preferred establishment. Brand? Don’t know at this update.
And then there’s the Connecticut ‘best’: Grote & Weigel (they cost like steak, but worth importing from the North if you are nuts about hot dogs).
As for ‘best’?true, no universals there, and doubts that one can get unanimous agreement on the premise.