Testosterone is Testosterone. Sustanon is Testosterone with 4 esters instead of one. Sustanon will result in more varying blood levels unless you inject frequently. No Testosterone will make you lose BF. Diet and Nutrition are the key to losing BF. Steroids are not magic drugs that build muscle and help you lose fat. You must have a base of knowledge in training, Nutrition, and diet to do things right. All AAS will shut down your natural Test levels. It sounds to me that maybe you should do some more research and give the AAS a break. Get yourself set up for success then use the AAS as a tool to help get you there. Not trying to be a dick. I want to see you succeed. Do more research look into diet and nutrition more. Read up on AAS and training. Also Many guys think Prop will result in leaner gains but truthfully I have never seen any proof of this. Test is Test the ester only effects the strength per mg and the amount of time it takes to release into the bloodstream. If you want less water retention while on test use a good AI to prevent excess estrogen conversion.