If it's your first time you'll probably won't want to go with the sust 250 simply due to the amount of injections that it would take to run correctly. Sust 250 is a blend of the following types of testosterone: 30 mg propionate, 60 mg isocaproate, 60 mg as phenylpropionate, 100 mg decanoate, so there will be various clearing times for each, thus the need to pin so often...I would just go with the enanthate if I were you.