With anabolic steroids as well as training, older methods that worked well in their day still work just as well today.
I always try for updates to be improvements in every way, and generally I think that’s been the case. However, with SERM’s vs anti-estrogens, it’s different trade-offs rather than absolute improvement.
Using an anti-aromatase allows controlling estradiol to a desired level, while avoiding the potential side-effect issues of the SERMs. That’s an extremely clean approach.
The SERM’s, and Clomid in particular, have two advantages for during-cycle use.
Clomid Clomiphene Citrate reduces muscle cell damage from endurance training and I suspect from high-volume weight training via its effect on cell membranes. It certainly does not seem to reduce stimulation of muscle gains. I wouldn’t expect gains necessarily to be better from this protective effect, but where gains are better for an individual, it might be from this.
Another difference between using a SERM vs an anti-aromatase is effect on SHBG (sex hormone binding globulin.)
oral anabolic steroid generally lower SHBG. Often, SHBG levels are driven extremely low during a steroid cycle, which isn’t desirable.
Estradiol, which increases during an aromatizing cycle if an anti-aromatase isn’t used, however works towards increasing SHBG. Clomid itself also probably directly increases SHBG.
So where anti-aromatases are used during a cycle, there’s little counterbalancing effect of increasing estradiol acting to increase SHBG. But where a SERM is used to control estrogenic effect during a cycle, estrogen levels do increase, acting towards normalizing SHBG.
While I don’t think that low SHBG levels adversely affects gains during a cycle, it might impair recovery somewhat, reducing net gains. This isn’t proven, but it’s a reasonable possibility.
The only disadvantage of using Clomid during a cycle rather than an anti-aromatase is some slight toxicity; for this reason, women are no longer commonly prescribed a SERM to take for decades of preventative use for breast cancer. I consider the SERM’s very low risk compounds for limited use, but something to preferably not take nearly-constantly for years on end.
Overall I’m satisfied with usually replacing anti-aromatase use for SERM use during cycles, but for those who have preferred SERM use or would like to try it, then do so. Methods that worked well in the past continue to work well today.