Test is Test. The active ingredient is the same exact thing. The only difference is how long it takes for the ester to release it into your blood stream, so it can be picked up by blood protiens (SHBG and Albumin) and be distributed throughout the body and released into a "free" state and act on a cellular level. Obviously, if you are trying to cut and stay lean, the faster acting esters will be a better choice. You can cut water in a few days by stopping test injections with fast acting esters. If you are trying to bulk, the longer acting esters are usually much cheeper and act for a much longer period of time, but your test levels will not raise extremely fast, and its virtually impossible to maintain a consistant level (which really isn't important anyway when you are bulking anyway), and you will retain water for a long period of time once the test injections have stopped. So, your choce of esters is a personal prefference. You should consider your goals, and think about the results you have gotten in the past from each ester. Once you have done several cycles, and know your body, and how it reacts to different AAS, you will learn exactly what to use and when. When I am trying to bulk, I use the cheepest test I can, and spend more money on the other AAS I am stacking with it. Later