Question: Which has more restaurants, Grimaldi's Pizzeria or Zpizza?

full_context: Document 1: Extreme Pizza: Extreme Pizza is a privately held restaurant franchise chain specializing in conventional and California-style pizza, founded by Todd Parent and Michael Pastor in 1994 in San Francisco, California. The chain currently includes over 30 locations in the United States, and one in Ireland. Most franchises are located in Northern California, as well as other states including Colorado, Texas, Virginia, Washington, Oregon, Idaho, and Michigan.
Document 2: Lombardi's Pizza: Lombardi's is a pizzeria located at 32 Spring Street on the corner of Mott Street in the Nolita neighborhood in the borough of Manhattan, New York City. Opened in 1905, it has been acknowledged by the Pizza Hall of Fame as the first pizzeria in the United States.
Document 3: Chicago Pizza and Oven Grinder Company: Chicago Pizza and Oven Grinder Company is a restaurant located in Chicago, Illinois. The restaurant was founded in 1972, and specializes in a signature dish called the "pizza pot pie." It enjoys local popularity and has appeared in many publications and television shows.
Document 4: Peter Piper Pizza: Peter Piper Pizza is an Arizona-based pizza chain with locations in Arizona, California, New Mexico, Texas, Oklahoma, Nevada, and Mexico, and formerly in Colorado, Utah, and Michigan. Restaurants usually have a large dining area that adjoins a game room with playground equipment and classic arcade games.
Document 5: California Pizza Kitchen: California Pizza Kitchen, known within the food industry as CPK, is a polished casual dining restaurant chain that specializes in California-style pizza. The restaurant was started in 1985 by attorneys Rick Rosenfield and Larry Flax in Beverly Hills, California, United States.
Document 6: Pizza strips: Pizza strips (also known as red bread, party pizza, strip pizza, or more commonly, bakery pizza) is a style of pizza common in the U.S. state of Rhode Island. They have a somewhat thick crust and are topped with a thick tomato sauce and oregano. Pizza strips are traditionally made with no cheese (though sometimes a bit of Parmesan cheese is sprinkled on) or toppings and are served at room temperature. Most are sold at small local bakeries. "Pizza strips" are baked in full size sheet pans which lend to their trademark size/shape since a full sheet pan is a 26" x 18" rectangle. Most bakeries will cut their product once down the center of the length of the pan resulting in two 9" by 26" sections and then cutting those sections into 9" by 3.25" "strips" yielding 16 strips per sheet pan.
Document 7: Greek pizza: This style of pizza may be referred to as "Greek pizza" even when it has non-Greek toppings, since it is typical of pizzerias owned by Greek immigrants. (These pizzas are similar to the pizzas served in Italian-style restaurants in Greece itself.) These establishments often also sell Greek specialties, such as Greek salads and gyros, and tend to brand themselves as "Pizza and Pasta" or as a "House of Pizza"; a code signifying that it is not an Italian restaurant, but a Greek restaurant serving Italian-style food. In the United States, the latter usage is common in New England cuisine.
Document 8: California-style pizza: California-style pizza (also known as California pizza or Gourmet pizza) is a style of single-serving pizza that combines New York and Italian thin crust with toppings from the California cuisine cooking style. Its invention is generally attributed to chef Ed LaDou, and Chez Panisse, in Berkeley, California. Wolfgang Puck, after meeting LaDou, popularized the style of pizza in the rest of the country. It is served in a number of California Cuisine restaurants. Such restaurant chains as California Pizza Kitchen, Extreme Pizza, and Sammy's Woodfired Pizza are three major pizza franchises associated with California-style pizza. Nancy Silverton's Pizzeria Mozza is also a popular California-style pizza restaurant in Los Angeles.
Document 9: Carol Grimaldi: Carol Grimaldi (née Lancieri, May 20, 1938 – April 10, 2014) was an American restaurateur and co-founder of Grimaldi's Pizzeria.
Document 10: Blaze Pizza: Blaze Pizza LLC is a Pasadena, California-based chain within the fast-casual dining restaurants category. Founded in 2011 by Elise and Rick Wetzel of Wetzel’s Pretzels, Blaze Pizza was modeled after the Chipotle concept as a made-to-order approach to serving customers. National Basketball Association (NBA) champion LeBron James is one of the original investors in the chain, which is touted by Bloomberg “as the next Chipotle”.
Document 11: Zpizza: zpizza (originally called z pizza and commonly known as z) is a pizza franchise based in Newport Beach, California.
Document 12: Papa's Tomato Pies: Papa's Tomato Pies is a historic pizzeria selling tomato pies in New Jersey. It was founded by Giuseppe "Joe" Papa in 1912 on South Clinton Avenue in Trenton, New Jersey. Papa's is the oldest family owned and longest continuously operating pizzeria in the United States. Papa's is the second oldest pizzeria in the United States after Lombardi's Pizza, however Lombardi's closed for a decade from 1984 to 1994 and was reopened under new management.
Document 13: Eatza Pizza: Eatza Pizza was a buffet-style restaurant chain founded in Arizona in 1997. As recently as 2007, it was one of the largest all-buffet pizza chains in the United States, with 112 locations in 14 states and Puerto Rico.
Document 14: Grimaldi's Pizzeria: Grimaldi's Pizzeria is an American pizzeria chain from the New York City area with several restaurants throughout the United States. It does not sell slices, only whole pies. The pizzas are cooked by a coal-fired brick oven.
Document 15: Your Pie: Your Pie is an American fast casual pizza concept, that was started in Athens, Georgia in 2008 by Drew French, and operates as a restaurant franchise with 58 locations across the United States. Your Pie provides customizable 10-inch pizzas and build-your-own panini sandwiches and bread bowl salads. Your Pie uses brick ovens to cook pizzas at a high temperature for a short amount of time. Gelato (Italian ice cream), craft beer and wine are also available. The interior décor differs from store to store, but all locations blend “old Italian” style with a modern, artistic approach.
ground_truth: Grimaldi's Pizzeria