The age old question. E or C. For most people there is no difference. I'm am probably one of few who only gets the good side effects from steroids. Never pct. Never used AU's. But test cyp puts a cloud over my head. I wouldn't say depressed but just down in the dumps. Little motivation. E never a problem. I've heard of one other guy having similar issues. I'm sure you'll figure it out. Good luck.