I used to run an organic farm experimenting with hydroponics and I did a ton of research on this.
What I found, organic does not mean healthier. In fact, a larger percentage of food related illnesses are reported for organic foods than foods without the organic label, which itself is controversial and misleading. This is largely due to the types of fertilizer used. Animal waste is used to fertilize organic foods. Yes, that is a fact. Organic foods can also use BT pesticides, which are the same chemicals in GMO crops where the BT is produced inside the plant.
The nutritional content also depends on many factors, including what types of fertilizers are used. Are those fertilizers available to be absorbed by the plant. It also varies by variety. Some plants, especially strawberries are better grown outside in the soil than in hydroponics. That was a rare case. I also read many studies on nutritional content of plants grown hydroponically vs organically and some studies found some varieties were more nutritional when grown organically, others when grown hydroponically.
The reality is, the industry is so competitive and the studies are funded by folks with an agenda, so the data leaves me skeptical on both sides.
Only 17 elements are required to grow a plant and these elements can be provided entirely through hydroponics. From my research, hydroponic vegetables, for the most part, are actually healthier for people to consume than organic vegetables according to the science, but there is a stigma that since hydroponics is produced by science and technology and the industrial farming complex that it is worse for our bodies.
The research indicates though that hydroponic plants can more easily absorb nutrients, they are healthier and better able to resist fungus and insects, so not only are they more nutritious, but they don't need fungicides, pesticides or herbicides to be sprayed on them. Plus, plants can actually absorb salmonella and other bacteria into the plant from composted manure, which even when washed can still infect the human gut.