Bear in mind that anyone who actually sells the food will have at least some of a vested interest in promoting one more than another.
I think you need to be happy that whatever food you choose is of good quality, has no nasty ingredients, and if it is important to you, take a look at the ethics of the company too.
As long as your dog actually likes the chosen food and thrives on it then you can quite happily stick with it. Of course, some brands do have lots of flavours some will suit one dog, and not others. Just need to play around a bit to find the one you both like (if you knoe what I mean!)
Then you can choose how often to feed the dog once it is adult. I prefer twice a day, but dogs are fine with once a day and I know some members have chosen to do that.
I had Buddy on Burns for a long time and was happy with that brand. He doesn't care what he eats, he's just a pig in dog's clothing. Now we do BARF, bt that doesn't suit everyone. Personal choice!