Ellen
IMHO, cats are obligate carnivores and vegan diets should not even be considered. Those two brands, and any vegan diet, have to be heavily supplemented. Lack of the nutrients not found in the vegan diets will cause heart, brain, and organ failure leading to seizures, blindness, and death.
Why do we need to change their ancestral diets and DNA to feed our human philosophies? They don't have issues with factory farming - we do, and there are other sources from which to get your food. The majority of the comments on here refer to some form of meat protein, mainly raw, so I think it's obvious about how contradictory it would be feeding either a cat or dog a vegan diet.
I only know of one vegetarian fed dog, pulled from the NYC AC&C. A neglected, female pit bull mix, who presents with an immediate flare up of reactions in her ears whenever fed a meat protein of any type - cooked or raw. Just recently that finally developed into the hematoma that was destined to occur. She is fed pasta, veggies, coconut oil, a supplement, some type of anti-histamine from the vet, and kibble that is usually a fish based one, and very little of it. I personally believe she might have had a reaction to vaccines since once at the shelter, they are jacked up with them because of no prior history, and then immediately spayed. So many develop cancer in a short amount of time, it's depressing.