Technically blends are better. They include fast medium and long acting esters so you get a quick initial response which is sustained over a period of time. Some people though say they get better results from Enth or Cyp alone which I feel is attributed to one single ester being a higher concentration in the blood. Sustanon's blend is formulated so the differnt esters have a synergistic effect on each other so a smaller mg amount actually yields greater results that the same amount of a single ester. In the real world though none of this counts for shit because everyone reacts differently to compounds so its a case of "suck it and see"! For most though Sus has fewer side effects, bloat, gyno etc. Hope this helps.