When it comes to plants grown in an aeroponic system vs a hydroponic one, there's no evidence that the taste differs at all. Some people can taste a difference in plants grown hydroponically as opposed those grown in soil, but the majority of people probably won't be able to tell one from another. Taste is largely based on the minerals that the plant absorbs during its lifecycle. While plants grown in soil have the benefit of naturally-occurring nutrients, one advantage to hydroponics/aeroponics is that you can specifically tailor your nutrient concentration.