People have become so obsessed with processed carbohydrates, they‘ve forgotten other stuff is unhealthy, too.
Red meat has a lot of protein, and a few micronutrients, like B vitamins and iron. It also tends to be high in saturated fat, and devoid of fiber. High intake of red meat is associated a higher risk for heart disease, cancer, diabetes, and premature death. The key word is “high”, of course.
Now if the pizza is piled with cheese, some of those same risks apply, and salt content can be a problem, too.
But if dairy products are used sparingly, the veggie pizza on cauliflower crust offers a ton of vitamins, fiber and none of the down sides of red meat.
Really the only potential health advantage of the burger is the amount of protein, but animal protein isn’t as healthy as that obtained from plants.