10% OC content. Gels are more directional than sprays. Get something with a UV marker included. And those tiny little keychain things are useless.
L
Personally, I prefer gel stream with a distance of 30 + feet.
A fog is too unreliable, and depends on whether you are upwind of the 'perp'; wind is too unpredictable
If you happen to be downwind you would probably pepper spray yourself.
With the gel, there is less worry about self contamination.
If the 'perp' is wearing glasses, aim for the forehead and it will drop/ ooze down into the eyes.
The idea of pepper is to temporarily incapacitate the offender so that you can make a hasty exit without your own harm or injury.
Check local laws, and buy from a police supply house.
Some pepper spray requires that you occasionally shake the container vigorously so as to mix up the contents; not so with the gels.