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.