It is difficult to determine definitively which debate was the most fierce, as debates can vary in intensity depending on the time, context, and the people involved. Moreover, the outcome of a debate is often subjective and can be influenced by many factors, such as cultural shifts, new evidence, or changes in societal attitudes.
One example of a particularly intense historical debate is the Copernican Revolution in the 16th century, which challenged the geocentric model of the universe (Earth at the center) and introduced the heliocentric model (Sun at the center). This debate was fiercely contested and had significant implications for both science and religion.
In the long run, the heliocentric model, proposed by Nicolaus Copernicus and further supported by Galileo Galilei and Johannes Kepler, eventually prevailed due to accumulating evidence and advancements in observational astronomy. This shift in understanding the cosmos marked a major turning point in the history of science and human understanding of the universe.
Again, it's important to remember that debates are complex and multifaceted, and there have been many other intense and important debates throughout history. The winning side in a debate can be influenced by various factors, and our understanding of certain issues continues to evolve as new information and perspectives emerge over time.