femara, aka letrozole, letro, is probably the strongest ai out there. It is very strong. It only takes .5mg ed or less to be effective. Personally, I think adex is a stronger compound than amomasin, but that's only based on personal experience.
I can only speak from MY experiences. I also believe Nelson's sentiments on us BB's using way too much anti-estrogen meds. You also need some estrogen for growth purposes among others.