here's my .02 on this one...
You need to do your research and feed what your dog does best on, not on what some blog about pets labels as their #1 food.
I really like the website http://www.dogfoodanalysis.com/dog_food_reviews/
- here you are able to do some homework on different foods. It teaches you how to read the label and choose what is best for your dog and grades a variety of foods on a 6 point scale.
Some find TOTW to be too protein rich for their dogs and they get diarrhea on it, others thrive. What works for one dog doesn't always work for another. You're doing well by feeding blue, if your dog has a healthy coat, no allergies, has energy, good teeth and no indigestion I would see no reason to switch.
I have dogs that are prone to having grain allergies so I just feed a grain free food. I rotate their foods to give them a variety of protein sources since they've not shown any protein allergies. Not all dogs have the stomach for that either though