I examine Feyerabend's defense for theoretical pluralism. I compare it to other influential defenses of pluralism, including Philip Kitcher's and Hasok Chang's. I argue that, unlike others, Feyerabend emphasizes importance of comparative evaluations when choosing between competing theories, and that such evaluations are enhanced by the development of multiple competing theories. I also argue that the development of numerous alternative theories enables scientists to make piecemeal changes when replacing one theory with another. I illustrate this by examining the impact of Tycho Brahe's theory on the Copernican Revolution in astronomy.