I'm using both (EQ & NPP not, regular deca)What's better? For mass building purposes, it's hard to beat deca with anything. With EQ, not only does it have to be used for extended periods of time, you need a fairly high dose.
At the end of the day, EQ will provide you with leaner and dryer gains. On the other side, deca will yield better gains in terms of strength/mass. IMHO.
/V