IMO the easiest would have in order:
Full hollow
Straightest edge possible (no smile or frown)
Wide as blade as possible (7/8 will be easier than 4/8)
So - a full hollow will be easier than anything else.
Among your full hollows, straighter edges will be easier than those with curves.
Among your straight full hollows, wider blades will be easier than narrow blades.
That's JMO...