Really can not Compare these 2 guys Totally Different Structures and Aesthetics...@ the end of the day comes down to BB preference in a Ideal, Nasser was One of the best of his Eras in a time and place where BBing was @ its most Competitive @ the Highest level though-out the 1990s its that simple, Flex obviously had the Lines, Aesthetics, Muscles bellys, Presentation of the Physique etc etc and of course the Results on his side, comes down to Personal preference nothing more.