Any training collar can become a torture device if it's not used properly. A prong collar can be a useful tool if it's sized correctly and you use it right. I used to use one with Ava and it didn't take us long to graduate from the prong to just a regular buckle collar on walks. I think the most important thing to remember that it's a tool, not a crutch so you'll still need to teach him how to walk politely on lead so you won't be using the collar forever.
Have you considered signing up for obedience class? Or depending on how old he is, puppy class?
Have you considered signing up for obedience class? Or depending on how old he is, puppy class?