Top 14 Most Profitable Franchises McDonald's. Units in operation: 39,360. ... Dunkin Donuts. Units in operation: 12,800. ... Taco Bell. Units in operation 12,800. ... Subway Franchise. Offers Financing: Yes. ... Anytime Fitness Franchise. Units in operation: 4,904. ... Sonic. Royalty: 2.5% - 5.0% ... Planet Fitness. Royalty 7.0% ... Orangetheory Fitness.