What do systematic reviews say?

GnRH agonists vs HCG

GnRH agonist probably leads to lower OHSS (mild, moderate or severe): overall risk compared with HCG (moderate certainty).

• Gonadotropin‐releasing hormone agonist versus HCG for oocyte triggering in antagonist‐assisted reproductive technology 2014 · Cochrane Headline outcomes only
  OR 0.15 [0.05, 0.47]
  8 studies · 989 participants
  Moderate