One is high in simple hunger generating carbohydrates and the other is high in cholesterol accumulating saturated fat.
Funny thing is, the other day I bought two lean patties and some brown whole wheat bread (I haven't had a burger in 4 months). I analyzed the calorie consumption. Two burgers, and 2 slices of toast totaled 900 calories. If the average person needs 2000 +/- 300 calories in a day to function, how can someone eat this on a regular basis and not become overweight??