That would depend on what brand you buy, usually most meats are pure meat, meaning beef burgers are beef burgers with no fillers to make up any part of the burger.(usually fat products) They are all healthy unless there is a high fat content in them, those are the ones that you don't want to buy or eat. I hope this has helped you out. :D
If you want healthy food, we have to eat vegetables and fruits every day, but a turkey burger is served normally with a lot of meat and oil too, it's one of fattest foods.