I know the importance of estrogen during a cycle but if you're one of those guys who has to run something DURING a cycle (or you just want to) what is everyone's opinion on which is the better choice. Is it better to run an AI and keep the estrogen from forming altogether or a SERM and allow it to build up and just keep it from binding (especially to the chest area which is what most guys are concerned with). Types and dosages would be appreciated.