Toomany variables to make a single conclusion on that. But I think it's the fluctuation of AAS in your system that causes the acne(if you get it) to become worse. Reason why maintaining a stable level of AAS in your bloodstream is crucial.
Personally, for me it's dball. I never break out, not even from Tren(Which actually reduces any acne I usually get whichis amusing, since Tren is supposed to be the worst for acne(Obviously ageneralization) but from most people's cycle's, it's seems to hold true. Anyways, for me dball makes me break out, reason why I almost never use it.