Can't compare, but i can say the t-1 pro is great and very well priced. I would say the delivery system for 1tu is the best by what I have read as compared the the other 1-test products. I would say get the t-1 pro, i love it. If u think lethargy or libido problems scare u, then get t-1. The results are very similar (check out the link on Chemo's signature). Remember, water weight is lost very quickly if that bothers u. I had to buy more 4ad with my t-1 pro because of the above problems. It helped.