I think it really depends on the food you give them. There are really two main types of diets....
You have the raw diet, which as it sounds is raw meat and vegetables. To do it right you need to tailor the ingredients for your specific animal. You give them raw chicken, cow, fish, deer, et cetera mixed with a lot of different things like carrots, potatoes, asparagus, carrots, cauliflower. You have to really plan ahead and do some math to make sure they get the right amount of calories and essential vitamins. You might have to supplement with pills to get it right. It's VERY expensive, but worth it if you do it right. There are a few companies that sell pretailored raw packages. They cost even more. If you have the time to do it though, then it's the best thing for a dog, but it takes a dedicated effort to do it right and make sure your dog stays healthy.
Then you have pre-made dog food. It's what most people think about. From there you really have a couple varieties. Some are complete shit, while others are actually very nutritious. Dry food vs wet food doesn't really matter unless your dog has chewing/digestion issues. The main separation between the different brands is whether it's mostly real meat or not. If you look at the list of ingredients, it should tell you what is in it. The absolute shit will have corn as the main ingredient. The best stuff for your dog will have actual meat as the main ingredient. When you look at the first ingredient, if it doesn't say: chicken, beef, salmon, buffalo, duck, venison, or some other meat, then don't give the shit to your dog. Basically what the crappy food has is a bunch of filler instead of real nutrition. Dogs are omnivores, but the main part of their diet needs to be protean at around 30% to 40%.
Essentially it doesn't matter OP. Dog food is just ground up and pressed food. Depending on what type you go with, it should have all the nutritional needs for your dog. If it doesn't and you're paying attention, you can add vitamins to their diet to supplement their meals.
As far as my personal experience I have 2 pit bulls. One is a 4 year old bitch and the other is a 2 year old boy. They are currently on a heavy mix of 4 cups Taste of The Wild buffalo, raw food, and GNC Multivitamin for Dogs. My bitch is a very sensitive dog when it comes to food. I've had her on every possible thing trying to settle her stomach, and the above works the best for her. Taste of The Wild is more expensive than a lot of other bags at $45/30lb bag but it's absolutely worth it. I've tried cheaper brands, but you can tell within days that she needs something different. She loves to eat it because it's like dog fast food, but her coat looks like shit. Her coat starts getting grey and dull. The hair starts thinning out. On top of that, she loses energy. I try to give them leftover raw food from mine and my girl's meals most days. They usually get about a 1lb. They'll also get random vegetables during the day. My dogs absolutely love to chomp on carrots. The daily multivitamin is just to make sure they get all they need.
Ultimately you really get what you pay for and put time into. The food available has been looked at by thousands of scientists to make sure it's balanced and nutritious for the dogs. The only difference is are you willing to spend more money to feed your dog bagged up good food or do you want to be cheap and give them bagged up crappy food? Or perhaps you have hours to dedicate to planning and preparing and do the raw diet, which is just the same thing except hopefully higher quality. The hardest part of a raw diet is making sure you give them everything they need. You can substitute tons of hours of dedicated planning and preparing for 1 metric *'fuckton of money'. Some people forget it's metric, not imperial.
