A number of factors make a good burger, and different weights of meat can be used for different styles. For the best-cookout-of-your-life burgers, aim for four ounces per patty.
Thin patties cook faster and develop a great crust but can dry out. Six-ounce patties may seem ideal, but they can be trickier to cook evenly because of their thickness.
If you want more meat, but prefer the crust on thinner patties, then cook more patties that weigh less, and double or even triple the number you layer on a single burger.
When shaping your patties, keep in mind that they will shrink, and therefore weigh less, once they hit the grill.