for me it is deca. i am very fortuanate that i never seem to suffer from any serious side when i do deca, no deca dick. i love it because it makes my joints feel great, i can train all day without any pain and it also makes me f&*$ for ever. i feel like i can go for days without dumping a load(and my girl loves it too) and my second favorite would be a toss between primo and anavar. they both really make my body hard and i think they are great to finish up with.(but if i am allowed to use test then that would be my second favorite0