I prefer aromasin for many reasons. I find Adex to be too harsh (sides), and aromasin has benefits that outweigh it's AI properties.
Aromasin on its own will increase both total testosterone and free testosterone. A few studies I've read have each shown it's effects on inactivating SHBG. This can lead to a noticeable increase in free test.
Aromasin on its own reduces my E2 by around 60% at a 12.5mg daily dose. Never had Blood taken on cycle, but at a 24mg dose e3d it's been enough to stop my "itchy nipples" dead in it's tracks (from 400mg test-e spread across 3 weekly injections).
However, I will say, aromasin is one of the most potent anti-libido drugs I've ever used... No desire in the bedroom when I'm on it due to low E2. Even while taking test. It can drop 10lbs of water off me in 3 days, as well.