I do not use Orijen, I don't have a dog and I don't feed cat foods with fish in them.
I personally just think Orijen is a bit higher quality, it is grain free (although is does have both potatoes and sweet potatoes, one of which is a main ingredient). Chicken Soup has five grains all of which are main ingredients (it is considered "main" if it comes before the first fat source) plus potatoes which are not a main ingredient. Orijen is also much higher in protein, I personally just consider it higher quality and would not be comfortable feeding chicken soup because of all the grains.
Chicken Soup is not a bad food of course, if you are on a tight budget I would certainly choose that over many other foods of a similar price. I know your breeder likes it but many breeders also swear by awful foods, so do your own research and make you own choice, either choice would be a good one, it's just up to what you feel most comfortable feeding and what you can afford.