The loaf style Fancy Feast cans are the ones to go with. They have a short ingredient list that is meat based and have no glutens or gravy or rice. Read the label just to be safe.
Of course there are better quality canned foods but a cat is far better off eating Fancy Feast canned than any dry food, no matter how premium. I think the artificial flavorings in Fancy Feast are very appealing to cats, that's why it has a reputation for being "kitty crack" but it's not the kitty crack that dry food is. And Fancy Feast canned should be considered for all cats refusing to eat any other wet food and for sick cats that have a reduced appetite.
Premium brands of canned like Natural Balance are great I think for healthy cats but there are certain cats, such as diabetic cats that cannot eat a lot of the brands that are considered high quality because of the addition of rice, fruit and veggies which are also unnecessary fillers for healthy cats. I would like to see more companies make high quality canned foods that do not contain rice, fruit and unnecessary veggies, that have the same nutrient profile as the Fancy Feast but with high quality meats and no artificial flavorings and colorings. The only brand I know of that is like that is By Nature Organics and my cats hated it.
Someone at a cat show once said that the best cat food is useless if the cat won't eat it so I agree that if Fancy Feast is the only wet food your cat will eat you should not beat yourself up.
I tend to give my cats a variety of wet foods, lots of high end brands, but I also give the occasional treat can of Fancy Feast, to balance out other brands like the high carb Natural Balance. Wellness is a great brand but I tend to question how healthy those sugar filled blueberries and cranberries are for my cats. My opinion is that no commercial cat food is perfect and all commercial pet food is flawed one way or another so variety is the spice of life. The best cat food I feed my cats is a raw diet called Felines Pride but it's so expensive that I don't feed it exclusively but in combination with a wide variety of wet foods. I discontinued dry and don't feed any kibble except the occasional greenies.
You can buy the occasional one can of another brand every now and then to see if your cat will eat it while you're feeding Fancy Feast.