IMO just about everybody in this thread needs to do more research with the few exception ,use know who u r.deca is one of the most powerful and commonly used compounds in any mass building cycle and eq is most comminly used in cutting cycle.that doesnt mean u cant use iether in a bul or cutting cycle.eq is known for it's ability for helping people achive a certain amount of vascularity it is a slow and minimal mass builder were deca on the other hand i feel is one of tyhe best strength and mass building compunds(in the proper cycle)available on the market today