>>21445922 (OP)Fuck man, that's like asking what's the best porn to fap to. There's so much nuance and so many factors that there's no "right" answer.
>Smash burgerGreat as a stackable, flexible patty that can act as a flat platform for further garnishing or melted cheese. Wonderful for things like butter burgers or Caliph-ornia burgers where the meat is just part of a full experience
>Juicy LucyIf you have a quality cook, who respects the time and effort that goes into melting the cheese core, it's a solid choice. However, the cook matters a lot, and if you're not going somewhere known for the stuffed burger patty, then you should really just pass on these guys
>Paddy MeltRequires the best white bread you can get; a solid Texas toast is acceptable here. Past that point, just keep it simple.
Really we should focus on two questions
>The Garnish QuestionIt depends a lot on who's reading this. Shroom and Swiss - lettuce, onion, and tomato - bacon - fried egg and cheddar - others? All of these work. But there's so much variance and so many interesting things that pair with beef (and ground beef allows any beef pairing) that we need to trim down things.
>The Bun QuestionThis exists only as an answer to The Garnish Question. Pretzel buns work well if we're including bacon or some other pork product into the sandwich; after all both are German. Ciabatta buns work well if we're going with a much more "modern" vegetable-heavy burger. Sourdough and brioche are always an acceptable, if safe, option.
There is no "best" burger, OP. Just tell the world your tastes and we can steer you to the right direction.