ok I'll give the input you are looking for but it may not be what you want to hear. Pro-hormones no matter what the claim are going to work on someone your age as well as 3.2 beer works on Mule. Basically most pro-hormones out there are androgen molecules that with feedback from the body convert to either estro or test depending on what your body has more of, so a 75 year old man with low test would probably benefit from the ph. A teen like yourself would get a little estrogen out of it. All the newer ph that a dmso delivered ect, may work "better" so to speak but basically come with most if not all the sides of the real deal.
At your age, your strength is on a world class level. You have the genetic potential to break any record you want, and if you do it assisted that is your choice. The problem however is that if you get on anything that messes with your htpa in the next couple of years you will cause long term damage and instability to your test levels. Say you hop on a light cycle of var, and up your bench to 500 pounds, that would be incredible for someone your age and weight, but you will have to deal with coming off eventually and when you do there is no telling how your body will react. On the other hand if you work and train smart and get your bench up to 600+ by the time you are 21-22 and then get on, you may be able to chase 800 within a few years. The choice is yours, you can have a little bit of glory right now and then fade away or you can realize your potential and set some real records....try to think long term. Like I said it is your life, good luck