Here are some advantages of pepper gel:
- Sticks like glue to an attacker's face and skin, hard to wipe off
- You don't have to worry about spraying on a windy day, no "blow back" in your face
- Others around you won't be affected by spraying gel
- You can use it in an enclosed area like a car, elevator, RV because it won't contaminate the air
- Your aim doesn't have to be as accurate as with a pepper spray stream
- Many have a longer effective range
- Usually costs more
Sounds like a "no brainer" to me!