Ledo Pizza is a pizzeria restaurant chain in the Mid-Atlantic and Southeastern United States headquartered in Annapolis, Maryland.
 Their first pizzeria was opened in Adelphi, Maryland, in 1955 on University Boulevard (Maryland Route 193) in Adelphi Shopping Center near the University of Maryland, College Park ( ).
 The first franchise was granted to the Fireside Restaurant in Berwyn Heights, Maryland, in 1979.
 Fireside Restaurant no longer exists.
 There are now over 100 restaurants in Maryland, Virginia, West Virginia, South Carolina, and Florida.
Pizza Schmizza is an American pizza chain with 23 locations throughout the Portland, Oregon area, and two in southern Oregon.
 Pizza Schmizza, primarily selling thin crust pizza by-the-slice.
Many regional variations of pizza the United States have been developed, many bearing only a casual resemblance to the Italian original.
 Pizza became most popular in America after soldiers stationed in Italy returned from World War II.
 During the latter half of the 20th century, pizza in the United States became an iconic dish of considerable popularity.
 The American slang terms "za" and "slice" can also refer to pizza.
 The thickness of the crust depends on what the consumer prefers; both thick and thin crust are popular.
 Often, foods such as barbecued chicken and bacon cheeseburgers are used to create new types of pizza.
Patsy's Pizzeria is a historic coal-oven pizzeria in New York City and is regarded as one of New York's original pizzerias as well as for its use of traditional New York style thin crust pizza.
Rosati's Pizza is the second largest local chain of restaurants in the Chicago metropolitan area, (behind only Portillo's).
 The Rosati's Pizza franchise now consists of 158 locations with 25 being Rosati's Pizza Sports Pubs.
 Rosati's locations offers Chicago Deep Dish, Thin Crust, Double-Dough Pizzas, Calzones, a variety of pastas, sandwiches, salads, desserts along with catering.
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.
New York-style pizza is pizza made with a characteristically large hand-tossed thin crust, often sold in wide slices to go.
 The crust is thick and crisp only along its edge, yet soft, thin and pliable enough beneath its toppings to be folded in half to eat.
 Traditional toppings are simply tomato sauce and shredded mozzarella cheese.
Aurelio's Pizza is an Illinois restaurant chain which centers its business around the thin crust variety of Chicago-style pizza.
 Aurelio's Pizza has three corporate owned stores and 37 franchised locations in 6 states.
 Aurelio's Pizza is the oldest Chicago pizza franchise restaurant, franchising since 1974.
Monical's Pizza is an American regional pizza chain, which as of 2017, consists of over 60 locations in Illinois, Indiana, Missouri and Wisconsin.
 About half of the locations are franchised, while the others are owned by the corporation.
 Monical's is known for its thin crust pizza, topped with garlic salt and basil which customers often dip into the Monical's Sweet & Tart French dressing, and is cut into small squares (about 1.5 in 1.5 inches square) rather than wedges, as seen at most pizza places.
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.

Question: Which restaurant chain primarily sells thin crust pizza by-th-slice Pizza Schmizza or Ledo Pizza?
Answer: Pizza Schmizza