{Flowood, MS} Which Wich? Superior Sandwiches, a Dallas-based American fast casual restaurant chain specializing in sandwiches and salads, has signed a 2,000 sf lease at Market Street Flowood. Which Wich? is known for its innovative ordering system by which customers mark up pre-printed menus on sandwich bags to order a completely personalized sandwhich with over 60 topping options to choose from. Which Wich? currently operates 256 locations throughout the United States.