Before we start, let's define what a bagel actually is. A bagel is a hand-rolled ring of yeasted wheat dough that is boiled and then baked. It has a dense, chewy crumb, a shiny crust from the boiling, and it weighs something. When you pick it up, you should feel it. If you pick up a bagel and it feels like a pillow, that's not a bagel. That's a disappointment shaped like a bagel.
This distinction matters because the bagel industrial complex has successfully convinced large portions of the American public that the soft, bloated, grocery-store ring of bread they're buying is the same category of food as what you get at a real bagel place. It is not. They are different foods with different textures, different purposes, and different levels of respect for the person eating them.
With that foundation established, here are the three. The True Bagel Triumvirate. These are the only correct choices when faced with a menu at a place that actually makes real bagels. Everything else is a supporting player.
A note on what's not on this list: poppy seed, plain, onion, pumpernickel, blueberry, cinnamon raisin, whole wheat, and everything else. These are not bad things. Some of them are good things. None of them are in the triumvirate. The triumvirate is not a list of all acceptable bagels. It is a list of the three bagels that a serious bagel person would order every time without thinking too hard about it.
If you're ordering cinnamon raisin, you're not ordering a bagel. You're ordering a sweet roll that went through the boiling process. That's a you problem, not a bagel problem.
↑ The Verdict
EVERYTHING. SALT. SESAME. IN THAT ORDER.
The True Bagel Triumvirate has been established. The criteria are clear: density, crust quality, topping contribution, and overall purpose on this earth. Any bagel that cannot justify its own existence against these three is merely a shaped bread product doing its best. Order accordingly.