If you are taming something and have an owl, you can use its freezing ability to heal it. It does not affect torpor or taming effectiveness. This way if the dino gets hit, you can heal it fully, and then let it wake up so you can try again without the risk of killing it.
They dont have the ability to pick up dinos, but, they can go extremely fast, especially when inprinted when swooping. If you want a fast flyer with a decent amount of weight and fairly high stamina, this is the one you've been looking for.
They can thermally detect any living thing around you giving a strong pvp advantage. Like a night vision with wings. Plus they can put you and your allies in stasis and heal you whilst being an ice cube. Decent airborne mount -
The Snow Owl’s healing ability is really good for farming blood packs. Just use the syringe as much as you can, then jump on the owl and heal. Bring a lot of food as the healing drains your hunger a lot.
Basically the product of an Argy (high weight and looks like one, minus the corrupted face), Daeodon (healing), and Griffin (dive attack). I would pick these over almost any Extinction creature, besides Velonasaur. And yes, this includes the Managarmr.