Cryopods are used for these 3 reasons:

#1: Can store dinosaurs inside for 30 days before they need to be recharged.

#2: Dino’s stored in Cryopods gain 5% more passive xp!

#3: When transferring creatures, putting the creature in a cryopod with the saddle equipped will let it keep it, compared to when it loses it’s saddle when not transferred in a cryopod.

Hope this helps your journey on the Ark! Thanks!