What do systematic reviews say?

GnRH agonists vs HCG

GnRH agonist may leads to lower ongoing pregnancy compared with HCG (low certainty).

• Gonadotropin‐releasing hormone agonist versus HCG for oocyte triggering in antagonist‐assisted reproductive technology 2014 · Cochrane Headline outcomes only
  OR 0.7 [0.54, 0.91]
  11 studies · 1198 participants
  Low