not having any personal experience with a pinch/prong collar i cannot comment on them (although i think they look awful JMHO),

but i have to agree with Aly and Clara on this one there are alot safer dog training methods to use these days without having to "choke" and "correct" a dog. when i started obedience classes with Clover we were always told to give sharp corrections often consequently i know have a terrible lagger when heeling and are struggling through novice obedience trials (im going to give it up as soon as we get that first title), i have now resorted to clicker traing with our dogs and will always clicker train from now on.

oh i also used to use a halti on clover and that worked wonders, we dont have to use it anymore (unless she see's a cat)

OT- i saw a lady walking her lil JRT oneday and she had a correction collar on as a choker, when i mentioned to her how to correctly fit the chain she snapped and said the dog was fine and if she had it on any other way the dog would escape and the chain was about twice as long as it should be