SERMs are best thought of as 1 generations, the first being tamoxifen and clomid. Tamoxifen is better at gyno prevention, and restoring lipid levels. It raises T levels more in healthy men, but IMO is worse to recover testicular size than clomid. Both decrease IGF-1 levels, although Tamox decreases more. Tamox is more toxic, though I do not believe it is overly carcinogenic in humans. Clomiphene can result in floaters inside the eye, which can be permanent.
The second generation is much more clear cut. Lower toxicity concerns, little to no impact on IGF-1, and more targetted activity. Put simply, Ralox is totally anti-gyno with little hormonal impact, and torem is highly hormonal with little gyno prevention.
Use this as a guide for serm use, and it will serve you well. Generally, my thoughts are:
Torem + nolva or straight clomid for PCT/test recovery
Torem for off cycle t boost
Ralox for off cycle anti gyno and/or nip tightening
nolva on hand as anti-e