Question: Which restaurant chain, Eatza Pizza or Grimaldi's Pizzeria, is buffet style?
Context: Big Mama's & Papa's Pizzeria is a pizza restaurant chain primarily located in Southern California.  The chain is notable for its extremely large "Giant Sicilian" pizza, which is claimed to be the largest deliverable pizza in the world.  Additionally, the chain gained notoriety when, during the 2014 Academy Awards, host Ellen Degeneres had Big Mama's pizzas delivered onstage. 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. Uno Pizzeria & Grill (formerly Pizzeria Uno and Uno Chicago Grill), or more informally as Unos, is a franchised pizzeria restaurant chain under the parent company Uno Restaurant Holdings Corporation.  Uno Pizzeria and Grill is best known for its Chicago-style deep dish pizza.  Ike Sewell opened the first Pizzeria Uno in 1943. Peppes Pizza is a Norwegian pizza chain that serves American style and Italian style pizza.  Peppes is the largest pizza chain in Scandinavia.  The restaurant was founded by two Americans, Louis Jordan and his wife Anne from Hartford, Connecticut.  The restaurant chain is part of Umoe Catering As which consists of restaurants such as Burger King, TGI Fridays, La Baguette and Cafe Opus.  Peppes Pizza is one of the first restaurants that brought foreign food to Norway.  9 million pizzas are served by Peppes each year with deliveries in 11 cities in Norway.  Their menu was first put online in March 1995.  The servings have been described as enough for two people and that the pizza chain is "a cut above the rest". The Pizza Ranch, Inc., founded in 1981, is a "fast casual" restaurant chain.  Pizza Ranch offers pizza, chicken, a salad bar, and a pizza and chicken buffet.  Pizza Ranch has over 200 locations in Colorado, Illinois, Iowa, Kansas, Michigan, Minnesota, Missouri, Montana, Nebraska, North Dakota, South Dakota, Wisconsin, and Wyoming.  Pizza Ranch is the largest regional pizza franchise in Iowa, Minnesota, North Dakota, and South Dakota. 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. 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. Tutta Bella Neapolitan Pizzeria is an Italian restaurant chain with five locations in Washington State.  The first location was founded in 2004.  The restaurant specializes in "authentic" Neapolitan pizza and is certified by the non-profit Associaziona Verace Pizza Napoletana ("True Neapolitan Pizza Association") which certifies pizzerias that use traditional ingredients and processes.  Tutta Bella was the first restaurant in the Pacific Northwest to receive such certification. Rabbe Anders Grönblom (May 3, 1950 Helsinki, Finland – June 29, 2015) was a Finland-Swedish businessman who started a successful pizza business in Vaasa, Finland.  His first company—a pizzeria—was called "O sole mio" and it was founded in 1976 in the center of Vaasa.  From there he expanded to a pizza franchise chain first called "Pizzeria N:o 1".  He was known as the "Pizza-emperor" (Pizzakeisari in Finnish), because he was the founder of a well known pizza franchise chain called Kotipizza which was the new name of "Pizzeria N:o 1" which expanded fast outside of Vaasa.  The chain is said to be the biggest one in the Nordic countries.  He was also the founder of a shipping company called RG Line, a hotel chain called Omenahotelli and another pizza chain called Golden Rax Pizzabuffet.  Most of his companies are subsidiaries of Grönblom International LTD, where Rabbe Grönblom acted as director.  Golden Rax Pizzabuffet however is nowadays a part of Finland's largest hotel & restaurant company Restel Oy Ltd, where Rabbe Grönblom sat on the board.  He was also on the board of the Finnish tyre company Nokian Renkaat (since 2003). Pizza Land is an independently owned pizzeria located at 260 Belleville Turnpike in North Arlington, New Jersey, which featured in the opening credits of "The Sopranos".  Additionally, in "Law & Order" episode 10.6, "Marathon" (1999), a pizza box from the restaurant was used by a suspect to transport and conceal firearms.  The pizzeria was opened in 1965 by Italian immigrant Frank Di Piazza, who died in 1991.  The pizzeria was built by Pietro Di Piazza.  It was owned by Frank's son Tony Di Piazza .  Tony and Debra Hunkele always had the pizzeria packed but later on sold to pizza maker Al Pawlowicz until his death in 2010, who purchased the restaurant from DiPiazza's son.  The store is now owned by Eddie Twdroos.
Answer: Eatza Pizza