The giant su-do-khoi is an easy flying plane. It really likes to hover! The knife hovers a little better than the su-do-khoi in my opinion. But the su do will do the neatest climbing flat spin I have ever seen. Both are excellent planes. Of you are new to hovering I would go with the knife. If you are already hovering the sudo or the top cap might make a better choice. They are just a little wilder. I really don't know why the knife hovers so well but it does. I learned to do rudder touches with mine. The plane almost makes me look good doing it too.