Eventually, Papa John's followed suit, and just recently, Domino's added a stuffed crust pizza to its menu -- but who does it best? Are Domino's and Papa John's Stuffed Crust Pizzas cheap knockoffs?

Shares of Domino's Pizza (DPZ) fell 4.4% in premarket trading to $466.01 vs. the 52-week range of $396.06 to $542.75. Papa John's International (PZZA) was down 1.1% in the early session.

I write about the franchising, restaurant and food services industry. Gastonia, North Carolina, Papa John's pizza restaurant at dusk. (Photo by: Jeffrey ... More Greenberg/Universal Images Group ...

Papa John's said its North America same-store sales were down 3%. International same-store sales were up 3%. The company reiterated its full-year guidance. Competitor Domino's Pizza similarly ...