Can't speak for these companies in particular, but hydroponic vegetables aren't particularly susceptible to being less nutritious. Plants make most of what they need from the air, water, and nutrients you give them. If they lack in one of those, the plant will likely wilt or die. Otherwise, the data typically shows that the vegetables are as nutritious, or likely more nutritious, since the plants have everything they need to grow, and it's in the plant's evolutionary best interest to put all their nutrition into the fruits.
