I think the Winstrols and Anavars are still the "choices" and the dosages of those have just increased on average. What changed at some point was the test dosages specifically. I even think there was a very specific point and that was the death of Munzer and his cycle plan found on him, the average test "base" really shot up because guys found it did add extra size. I remember Dan Duchaine saying something like, "wait, what the hell's going on here, test at 3.5 grams a week?" That's the point where things changed a little as far as cycle design. Relatively nontoxic but relatively powerful anabolic, so it made sense if you were going to increase total dosage.
I remember Chad saying Nasser really really loved Winstrol and did a lot of it, but Nasser also apparently told people the testosterone dose was astronomical. Nasser joked around a lot but I'm positive the test was up there.