Half life of Test Prop is - 4 days
Half life of Test Cyp is - 8 days
Half life of Test E is - 10.5 days
so there is a difference in the testosterone CARRIER ester , and how long the drug takes to absorb into the body and how long it stays .
Test E absorbs slow and stays in the body for 21 days (3 weeks), test Prop absorbs fast and stays for only a week. Test cyp is right in the middle ground (prob most similar to natty test).
so there is a difference and reason for each one. also , the faster the absorption the more MG for MG dose your going to get out of it . example, 100 mg of test prop should yield a 92% absorption, so 92 total mg. Where test E may only yield 70% absorption , so only 70 mg. theres a reason why test E is dosed at 250mg/ml , cause the absorption is much lower, so you need a higher dose