this study shows that clomid is better
Disparate effect of clomiphene and tamoxifen on pituitary gonadotropin release in vitro.
Adashi EY, Hsueh AJ, Bambino TH, Yen SS.
The direct effects of clomiphene citrate (Clomid), tamoxifen, and estradiol (E2) on the gonadotropin-releasing hormone...