Choke chains are evil, Niñoi just about choked himself with one, our vet and instructor from Layla's obediance class both said never use a slip/choke chain. I would ONLY use it for conformation. Niño loves his prong/ping collar and actually willingly puts it on. He can slip out of anything else except for choke chains and martingales. I don't think he really enjoys the feeling of it being all around his neck because he pulls a lot and very strong. This is a very touchy issue and I stand strongly behind my choise.
edit: We have tryed:
Choke, prong, halti, sporn halter, martingale, regular collar, and a harness. Guess what only really worked? you guessed it, the PRONG!