If the deca dick didnt exist and without being bias which do u think would yield better gains, 400 deca for 10 weeks or 500 test for 10 week?? Main purpose of cycle to gain size!!!
I would say that you would gain more muscle mass off of 400mgs of Deca than 500mgs of test. You will have a harder time recovering from the deca though.
If deca dick made you extra hard I'd be a dubol junkie. I'd personally go with NPP over "deca". Anyways, deca alone isn't a very good choice, but deca and test is a great combo.