The regular gutter hook, called quick & secure, is an endurable hook consisting of the same material as the whole gutter system.
Gutter hook compact
The compact hook is a simpler hook which only can be mounted on a vertical fascia board.
Gutter hook with attach device
The gutter hook with attach device is just what it sounds like.
Adjustable Gutter hook
The adjustable gutter hook has fixed angles for the most common roof pitches. You adjust the hook on the ground before you mount it on the fascia board.