That is known as the Mriga-Mudra.That is mentioned in the dhyana-Mantra of Lord Shiva:
dhaayet nityam mahesham rajatagirinivam chaaru-chandra-avatamsham/ ratna-aakalpa-ujjvalangam prasu-mriga-vara-abhiti hastam prasannam/padma-aasinam samantaat stutam amarganair bhyaghrakrittim vasanam/vishvadyam visvavijam bhavabhayaharam panchavaktram trinetram --Reference :Stavakusumanjali,Udbodhan.
Normally mind is compared with a running deer and this mudra signifies keeping the mind still in case of Lord Shiva, as He holds parashu (axe) in other hand that signifies slaying the deer ie calming the mind.
But Sri Ramakrishna so far as I know did not use any such mudra intentionally.All was the effect of divine ecstacy.But it looks like Mriga-Mudra. The question of superiority or inferiority does not aruse by the way,Only Lord Shiva, known as the Pasupati (Mriga is a Pashu) has Mriga-Mudra in His hand.
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