Both are good ones. But I prefer Deca, because it capacity or property to dealing with ache joints. When I use it, the ache joints disappear inmediately and that mean that I can use more iron weigth without discomform, and more weigth more mass.
If you are like me with some ache joints ( my left shoulder and elbow and my rigth lknee ), is prefereably Deca.
By the way, for price too, here the Deca is very cheaper