I think SARMs are mostly useless compared to roids. Perhaps RAD140 could be used on cycle to protect the prostate, but for bodybuilding its sides are the same of worse than common roids.
All this protect the prostate is fuzzy to me.
Even trenbolone is easier on the prostate than test due to lack of dht.
Testosterone really is the "dirtiest" drug, but afaik, maintaining a physiologic (not necessarily borderline high or high normal, but just normal) amount of the "big 3" (test, estrogen and dht) is our best bet as far as we know to maintain proper bodily functions.