I like aromasin the best. But, since I ordered letrozole at one point for some gyno related problems, I had it laying around this cycle and used a bit of it. I used something like .25 mg per day or so and I still grew just fine. Just don't overdo it if you go this route. As some have talked about recently, over-use of anti estrogens can kill gains and is often unecessary. "Use as needed" no more. Good luck!