Basically Methandrostenolone / methandienone is Methandrostenolone / methandienone no matter what brand. So as long as real then both good.
With that said some react better to certain brands than others and so personal choice. I do not have a valid reasons for why this is and could be many different ones as each course is different (i.e. what it is stacked with, diet etc etc).
Wrongun!