Nakita was given Wellness since she was a kitten at the breeders home. Since I brought her home, I have her on Wellness canned food and Innova dry (only because of availability). Wysong has many alternative products (ie: for cats with specific health problems, vitamins etc.) and it is also ranked as a premium food.
Here's the website for Wysong:Wysong
Here's the website for Wellness:Wellness
To me, all the premium cat foods are comparable. They try to stay away from fillers as the main source(ie: corn, rice, etc) and use no byproducts and artificial colourings, flavourings, dies and preservatives. Also if you research, you will see strong testimonials from all the brands. There is not just one best food out there. I think the best diet you can give your cat is the most natural one you can afford. I would love to give Nakita even a partial raw diet but she won't go near the stuff!
You have to trial test the foods and see which one your cat will eat, what you can afford to pay, and which products areavailable in your area.