Agree with @LouisAraiza. We have 5 Guys and In-n-Out. Lots of hype, but nothing special as far as I'm concerned.
Best restaurant burgers are found in Utah at the Crown Burger. Get the Crown or Jr. Crown. Meat, lettuce, pickles, secret sauce, and pastrami.
Best burgers ever (hands down) are served at my house. Ground beef/round/chuck + a little garlic powder, onion powder, kosher salt, fresh ground black pepper and an egg. Grill them over charcoal, serve with fresh homemade buns, homemade balsamic mayonnaise, tomatoes, spinach or romaine lettuce, and a slice of red onion. That's just a little piece of heaven.