It all depends. An unbalanced, poorly formulated raw diet could be a lot WORSE than what you're currently feeding.
Diamond is a mid-tier food, solidly in the middle of the pack (a pretty good price/value proposition, but not top of the line). If you're on a budget, it's a fine choice at a low price -- as long as you are careful to monitor recalls and save date codes on bags, as they've had some very
serious recalls. Diamond Naturals, Kirkland (Costco) and 4Health (Tractor Supply) are all sister foods with nearly identical ingredients, made in the same plant. We feed a lot of it in rescue because
of the price-to-value metric. I think of it as the lowest tier of food that I'm comfortable feeding a healthy dog that has no problems digesting chicken-and-rice kibble. I've seen many dogs in rescue that were fed a lot worse foods in the past and had a very positive transformation on Diamond Naturals/Kirkland (coats thickened and shined, they got a nice body composition, and their digestion improved) -- it works well for a lot of dogs.
step up to better kibble though -- independent companies that own their own plant, with clean recall histories, transparent sourcing, and excellent quality control: Fromm, Champion (Acana/Orijen), Victor, etc. Most of my personal dogs do very, very well on Fromm's Four Star rotational diet, and the company's consumer responsiveness is fantastic (if you call them, a nice human in Wisconsin will help you with any questions, and if she doesn't know the answer, she'll get someone who does -- even if it means going to the company's top executives).
Kibble is a compromise though -- it's prepared with very high eat. High heat can produce by-products that are undesirable, and destroy amino acids:
New Study finds Drying Time of Kibble Lessens Nutritional Value ? Truth about Pet Food
It also requires carb fillers in order to act as binders (if not a grain, some replacement for one like tapioca). It is convenient though! In a multi-dog household, it may be a necessary compromise.
You do have to be very, very careful about how the company sources ingredients -- not just how slick their marketing is! A lot of meat used in kibble is rendered meal that is incredibly low quality, and most kibble companies use some very cheap ingredients from China. They will put "sourced in USA" because someone sitting in an office in the USA is doing the sourcing (purchasing), knowing that most consumers won't look deeper into where the ingredients are really from.
Beyond kibble, you can step up to "just add water" dehydrated foods like the Honest Kitchen, Dr. Harveys, or Sojos, produced with very little heat. THK's are made in a human food plant -- their employees reportedly taste it coming off the line because it's human food ingredients, in a human food plant. They're reasonably transparent about ingredient sourcing (as is Dr. Harvey's). I'm told the chicken version of THK tastes like a pot pie that's missing the salt. These companies also make base-mixes to which you add your own meat (cooked or raw) to create a balanced diet (no worrying about missing micronutrients--it's all done for you).
The next step up is a complete commercial raw diet -- air dried or frozen. Companies like Primal, OC Raw, Bravo, Darwins, and many others make very good, complete diets. It's quite expensive to feed a large dog this way, but it's possible if money is no object.
You can also study up to learn how to prepare your own, but it requires careful planning (and ensuring micronutrients are well covered).
You can also do some combination of these -- e.g., feed a base mix plus meat most of the time, rotate in Ziwipeak when you travel or want something different, buy some raw frozen now and then, etc.
I think you need to figure out what you can reasonably spend per month, and work backward from there. Some of us who feed exotic options have difficult, health-compromised dogs who have
to get a non-kibble diet to thrive because their GI systems are so fragile. Others choose to do it for perceived health benefits.
Think of food as a spectrum. Most food falls somewhere in the middle of it, and your goal is to push the needle toward the good end, as your resources allow.