I understand that this is just a topic for opinions, but still it is impossible to choose 1 best or greatest athlete in history, even the top 10 is impossible. all sports are different, with different popularity in the world. for example, some of the names that are mentioned above, I don’t even know such athletes, so I can’t imagine what kind of sports they are.
I think that even within each sport there are different opinions about who was better.
I would even add that in all sports, it is no longer correct to compare athletes of the 20th century with athletes of the 21st century.