For the record, I am the holder of two graduation certificates, and my trainer, Elaine Stern, even kissed me while handing over the diplomas. She doesn't do that for just anybody.
Needless to say, I have tried it all (the gear, that is).
The results:
Gear: Harness and leash with handle (which I am modeling above)
Control: Good
Plop O'Doom allowance: Medium—requires a push and a pull to outmaneuver
Restraint: Good, depending on your viewpoint
Chafing: Good, except during the POD outmaneuver
Vet approval: Yes
Ease of use: You put your right foot in, you put your right foot out...
Public acceptability: Good
Gear: Prong collar
Plop O'Doom allowance: Maximum (good for me!)
Chafing: Medium to Poor
Vet approval: No
Ease of use: Good
Public acceptability: Poor (you can see why)
Gear: Gentle Leader halter (the one that goes over your nose and behind your ears)
Control: Poor—like trying to stop a freight train with a ribbon
Restraint: Ditto (although it worked beautifully for Sparky)
Plop O'Doom allowance: Maximum (excellent!)
Chafing: No more nose hair!
Ease of use: Medium
Public acceptability: Thinks it's a muzzle