New York: In any bagel shop in New York, you'll find a veritable pantheon of bagel types; pumpernickel, raisin, garlic, onion, salt, bacon, everything, sesame, poppy, and everything else under the sun. The diversity of New York bagels makes them stronger, much like Captain Planet.
Montreal: In Montreal, however, the decision of what type of bagel to get is usually much simpler. Purists stand by the idea that the only true Montreal bagel can be topped with either sesame or poppy seeds ("black seed" or "white seed", in their lingo).
The Edge -- New York
Having a huge array of flavors is a boon to any bagelry, since it allows everyone to find something that'll make them happy.