There is nothing good to say about processed meat. Sausage, bacon, and ham are all super high in salt, saturated fat, and nitrates. All of these are associated with cancer and obesity and cardio-vascular issues.
Hamburger and chicken are marginally less unhealthy. However, the barbeque sauce is pretty much sugar. The meat generally comes precooked to pizza chains, so it may not be degreased or may have been cooked in trans fats.
Go easy on meat and avoid meat lover style pizzas.