They were both enormously gifted offensively but they were also very very different. It's pretty close given their offensive successes and talents within their chosen styles.
Duran had a bigger repertoire of skills, thus his proficiency at different ranges, combination punching ability, Fitz shift, inside work, balance and foot speed, combined with mindset and his boxing lineage through Brown and Arcel, allowing for his p4p achievements. Due to size, hand speed and foot speed, SRL's top victories may appear to have trumped Duran's, specifically Hagler, Hearns and Benitez being better than Leonard, Dejesus and Buchanan/Palomino/Barkley, so he may appear visually more appealing to most fans, but I wouldn't argue that he had greater offensive skill. This is harder to answer than I thought - I say Duran but I'm also mindful of the opponents beat résumé.
I think he probably means how they spoke to each other's wife, mate. It's hard to tell really with such an obtuse title thread.
I don’t know why you’re being a wise @ss about it but an “Offence” is a very layered thing (shocking right?) and people can be better at different aspects of it. Hence the question.