Drum, of any color, are not in the same league with Kings or Cobia.
The big Drum are powerful and tenacious, but are really just an overgrown Croaker.
When it comes to Kingfish and Cobia, you really don't have to choose.
They're found in the same waters at the same times, more or less.
From the piers on Nags Head and Hatteras, the guys fishing "King" rigs take as many Cobia as they do Kings.