It will lower all of your estrogens more evenly that anastrozole. Studies have shown adex to lower estrone levels to undetectable levels even at rediculously low doses, which is not what you're after. And most guys have to use too much of it to get the desired effect on lowering E2 which is what we're after here
And this all leads to less long term sides (regarding blood lipids, bones etc.)
Personally I have never heard of anyone who has tried aromasin to want to go back to adex because they simply realise it works better and with less sides. ... and that's true
The main reason why most people use adex is well because most people use adex .. (And the guy at the gym who is huge told them so)