I haven't used a choke collar in twenty years. A properly fitted prong - tight and just under the jaw - is what I use.
Harnesses are used to teach dogs to pull and they are "free" to do so as long as I didn't give them a contrary command. As dogs are creatures of opposition the harness is an excellent tool to drive them into a decoy.
It's all moot if you don't know the why, how and timing of corrections.
Prongs may well be banned in SanFo.