Both are very affective if used properly.Kodies obediance class,they had to wear a 'training collar(i dont call it a choker,sounds too harsh)I find them both affective,but i prefer a Prong,Kodie wears one everytime he goes out for a walk or to Petsmart.IMO Prongs are better for larger dogs.I'm not against these collars,as long as you use them properly.