Assets Cheaper in Unity Store

Another difference is that every team member needs a licence (needs to purchase) a copy of assets purchased from the Unity store.

The UE4 marketplace does not require this, for a team they simply submit a list of usernames who need access to a purchased asset.

Source: New Unity Pricing - Off-Topic - Epic Developer Community Forums

I’ve seen others use Unity store assets in UE4, but not sure of their official policy.

I know for sure you can’t use any assets created by Epic in other engines (all the samples etc), not positive if you can (but pretty sure it’s allowed) use UE4 marketplace items in other engines.

Here’s a quote from the Seller FAQ: