Testosterone is testosterone as they say. Chemically speaking it’s the same no matter who manufacturers it. It just boils down the dosing being correct or not. The difference comes in the ester it’s attached to. I prefer Enanthate for serious bulking cycles as it reaches higher peak levels over time than Propionate but Propionate is the preferred ester for lean mass cycles, cutting cycles and finishing off longer ester cycles before entering into clomid. Propionate is also the ester of choice for short 8 week or less cycles.
There is a difference in brands as far as accuracy of mg/ml and the BA content. Mexican stuff I like QV Enanthate and Propionate, Euro gear I like ICN Enanthate.
-TAZ