People like to divide themselves in camps, and the smoked meat "war" is no different. Some will swear by Main, others by Schwartz's. And let the battles begin.
This is futile. Main is a diner featuring a much more extensive menu than its rival across the street. The seating arrangement is also more conducive to privacy due to the booth seating. Its opening hours enable Main to snag late-night smoked meat hunters when Schwartz's retreats to prepare for next day's fight.
Their food is solidly good. The smoked meat sandwiches are abundant and the meat is great.
So, do you prefer more private seating, a larger menu, a shorter lineup (or none at all) or a snack at 2 am? The Main is your spot.
I am still a fan of Schwartz's, but the Main has its attractive traits.