This document lists several rivalries across different industries throughout history: - Coke and Pepsi have battled for over a century to be the top cola brand, with Coke regaining the lead in the 21st century. - Apple and Microsoft have competed neck and neck as the leading computer and tablet companies, while Dell and HP also strive to be the best. - Google and Bing are two of the world's most prominent search engine rivals, with studies showing Google provides more and better information. - In ancient Greece, Athens and Sparta were the two top cities, each believing they had the best warriors, athletes, and cuisine. - Nintendo and Sony have been video game rivals since their inception, creating iconic