Simple question what Boxer had the 'Fight IQ'. I'd probably say Joe Louis because he faced so many people in his time with differing styles yet he was very successful.
Robinson, Greb, Pac, Gans, Duran, Ali, Charles, Hopkins, Langford. there are a lot who were way up there. Typically Id look to fighters who fought tons of opponents across a range of styles and sizes, and over an extended period of time.
