I ran human grade last summer, then tried vet first time this summer, even took higher dosage of vet, there is no comparsion, human grade stronger, no pain. All it is is more green, but worth it. I won't go back the the mex crap.
Testoviron is the best enth on the market, however it can be quite expensive. It really depends on the 2 companies you are comparing as well as their relative prices.