My 2 sheckels:
I'll bet 50% of the population (women) pretty much unanimously favors old generation bodies over new ones. A lot of women don't like guys who are too big. After all, the psychological basis for a yardstick to judge beauty is the median characteristics of a population.
I think it's a little more complicated with BB though. IMO beauty and the appearance of strength are two different characteristics that make men attractive. They partly go hand in hand, but aren't one and the same. New generation BB's sacrifice some beauty for the visual implication of strength.
While men ARE sensitive to the attractiveness of other men, it exerts less influence on their perceptions than it does on those of women. So even though women are attracted to the appearance of strength, they weigh the aesthetic component more heavily than men do, and favor old generation bodies. Men weigh the strength component more heavily than women, since they are less sensitive to male attractiveness, and so it's understandable that there would be a lot of disagreement between men about what type of body is better since men are going to differ in their degress of sensitivty to male attractiveness and in the degree to which they value strength.