OH-C21 vs 6 Mass

[Bigkay]

Newbie here, just started taking the ohc21 about 2-3 weeks ago and defiantly feel the gains and mass coming along, but I just heard about 6 mass, should I stop taking the ohc21 and get the 6 Mass Instead? Which one is best for mass gain? Also, could I use both as a stack? 6 Mass seems to be pure mass but ohc21 seems to have the mass but with the additional cut.

 

[ablaman]

I would recommend you stick to what you are using and not mix things up.
No point in jumping ships before you finish it.

I personally have not used either but just using common sense.

In addition, what changes have you seen with OH-C21?