It should be noted that NOT all Testosterone esters produce the same effects, qualitatively or quantitatively. Shorter esters aromatize less and are also less anabolic, while longer esters are more estrogenic and more anabolic.
Having said that, I prefer either Sustanon or Propionate with Primobolan. The powerful androgenic effect of Testosterone synergizes the strong anabolic effects of Primobolan.