Well being that Ergo has the mix with 2 and 3 ene isomer it makes it a little dirtier for some- myself included as far as the androgenic sides: acne, increased oil production, BLOAT, aggression... and for Ryan at 45mgs some serious BP issues
While Phera has just the 2ene isomer which for some-myself included makes some mellow, although it breaks me out, less oil-with me but thats with doses 30 and up, and does not make the scalp oily or itch or aggrevate MPB, its just to me more clean, and def a serious mass builder. By no means am an Expert on PP, but I def have benefitted and researched, and picked the brains of Dr. D, and scoured the board when ALR was on the board... Knowledge of the compound makes a big difference...