As Crystal said, there are opinions galore, many of it contradictory! It will make your eyes spin! For example, some people say Wellness is great, others say it gives them diarrhea.
I'm currently rethinking my pup's foods as well. I can't do raw - I just don't have the energy to do it properly.
So rather than focus on a particular brand to start, I plan to research multiple "non-partisan" websites as to what "content" makes a good dog food. For instance, you'll hear about too much protein, too little. Too much grain, shouldn't have corn, etc. etc. etc. I want to try to gather objective evidence before I find a brand.
Then I'll go shopping for a brand that fits the criteria that I think is right
Then I'll read the reviews and make a final selection.
btw - my pups are both on Pro Plan Chicken & Rice and bot doing great frankly (nice coats, no allergies, firm stools, etc)! The only reason why I'm thinking of switching is that I reread the ingredients and found corn meal fairly high up there, which I keep hearing is not great (though I don't quite know why YET!)
What you don't want to do is keep swapping foods - it's hard on their digestive system. If you are going to swap, make sure it's a gradual switch (mix the two foods together, gradually increasing the volume of new). You should plan on 5 to 7 days for switchover.
Hope this helps!