I like the spring steel hook clamps that are more common in europe, as opposed to the popular forged clamp sold here. I do NOT like the 'super hooks' or whatever they're called that have no pan adjustment!
As for safety cables, ALWAYS, in this order:
Hang light, keep hand on clamp, finger tighten bolt, then safety cable, then wrench tight. Opposite when striking.. wrench loose, remove cable, then all the work is with your hands.
The point being that the instrument is safed any time you're fumbling with your wrench, and while you're torquing the C-clamp down, as that is the most likely time for it to fail.