I have never used aromasin but I have taken the other two and am on Adex now. Letro is definitely the strongest but that doesn't necessarily means it is the best. It just means it is easier for you to inhibit your aromatase too much and have too little estrogen and hinder your gains with some side effects. As far as the other two, I know they work just as well. The important thing is to figure out what dose is best for you for whichever one you choose. I wouldn't ever recommend someone in your situation to switch AIs mid-cycle because you aren't familiar with any of them. Most people have to figure out AI doses through trial and error since bw usually isnt available to them as often as they would like. If you were to switch mid-cycle to an unfamiliar AI then that means you are stuck trying to figure out what dose is best for you for that AI all over again.