From burger behemoths to international pizza joints, F&W rounds up the world's largest fast food chains. McDonald's The burger behemoth tops the list over Subway by a few hundred stores worldwide. While the Big Mac is ubiquitous in the United States, in Europe the chain also sells the Big Rösti for a limited time each year — beef patty, hash brown patty, Emmentaler cheese, and bacon on an onion-flavored bun.