Well, regular T-200 has only one esther of testostrone, it is called enanthate. However, Sustanon has 4 different esthers-- Propionate,phenylpropionate,isocaproate, and deconate. The advantage of sustanon is that it esthers will each benefit from different receptors in you body, but T-200 will to only one type of receptor.. Side on T-200 are a little bit worse unless you taper it off at the end of your cycle. Sustonon is self tapering, so you don't really have to worry about a "test crash". Although Clomid is still recommended. I personally have got better gains of T-200 so it is my favorite, and not to mention alot cheaper..
Hope that helps.