Aromasin is the stronger of the two, and with those dosages it may be the better option (for me personally anyway). But using arimidex at 1 mg ed may be plenty, some guys can get away with no anti-e's and these types of gear dosages, for me it would be atleast 1 mg./day of arimidex. It is a very individualized thing and you only have one way to find out what is going to work better for you personally....