Ive run test and dbol w/o anti estros and didnt have too much of a prob (some bloat and fat, no gyno) but when i combined them with deca......i was so bloated i felt sick all the time, i put on way too much estro fat and got really sensitive nipples. Deca alone or with drol=no fat gain or bloat for me. So if i ever use test (probly not) or dbol again, it will be with a estro blocker/AI, the fat i put on from estrogen is hard to loose, so i just dont want to put it on in the first place.
I dont believe the estro has anything to do with the strength of the drug, at all. The compounds ability to aromatize doesnt make it stronger, it just is in a different place in the pathway from cholesterol-------->aldosterone/estrogen/glucocorticoids....and they happen to be converted to estrogen via aromitase. oxymeth, tren, fluoxy all are very strong compounds but have no estrogenic activity.
My point is....estrogen has some benefits yes, but the negatives far outweigh the posistives (at least for me) and i can achieve size and strength without it.