Hey DanaFo,
In my case I would probably choose a Delegate, since Interfaces in Unreal are tricky to say the least, and really actor components are supposed to replace any need for them at all. If this is for lot’s of actors (not u-objects) that need to do something based on their clock state a component version may not be a bad way to go, since you can add it to any actor you like then 
If it’s specific though, delegate should be fine!