AIs and HGH synergize way better, SERMs are used way more for PCT rather than for height enhancement, plus if you are 15 or older than 15 hgh is not gonna do anything for you really, there are also very few studies on SERMs for this purpouse, and serms can block estrogen in the growth plates and other areas, but they don't reduce circulating estrogen like other meds, and also estrogen itself plays a key role for bone health, so crashing it with SERMs it probably not the right approach, and they can also increase circulating estrogen indirectly (by boosting LH/FSH and testosterone), also, AIs have way more studies and RCTs than serms for this purpose, if i was you i would go with AIs.