Atlantic salmon pound for pound fight better than King Salmon.
No King Salmon in Atlantic Ocean that I know of, only in Pacific Ocean and Great Lakes. Hottest fish I have found are fall run steelhead and summer run (Skamina) here in the Great Lakes right after they have entered the rivers. Give those a try, they will get you the drag screeching runs you are looking for. Landing 50% of them is great achievement. You will remember all of them. Catch and release. Have a good holiday !