Primoteston is 100%Enanthate,if you have a box,you can read it for yourself. Now,if you have a choice of what to use,Sustanon or Primotest, I would go with Primotest, it won't make your sore, won't give you Sustanon flu, will make you slightly bigger,and even will bloat a little more then Sust, but it's no big deal with your dosage,also you can control it with Arimidex or Cytadren, or even Nolvadex(but I woudn't).
Also, usually, Sustanon is a little more expensive and more popular,so if you decide to sell it, you will get more money out of it.