Dan Lurie once told me (for anyone who knows who he is) that he challanged John Grimik (for anyone who knows who he is) because he was more vascular and veins look like more muscle on stage. That's what I liked about Mast. I was never going to be super muscular but it gave me veins bulging in my THIGHS! Unfortunately it also made veins bulge in my HEAD! It made me look like an alien!
I was always a fan of winny. In fact, I think it's the better bang for the buck over var. But, like you said, everyone responds a little differently. AND, the dosages people take makes a difference. People complain about back pumps with D-bol and I never had that problem. Then again, I never went over 20 mgs a day.