Any opinions on which would be more efficient of a setup? (terms of stealth, electricity, noise, etc)
Great results with DWC. More oxygen to the plant the healthier the plant. It is along the same priniciples as aeroponics, more oxygen to the plant the healthier. DWC would be a stage between full on aeroponics and other types of hydro growing. This is without mention that a soil grow only gets something like 50% oxygen to the roots and DWC is more like 80%-85% oxygen to the roots. I have read that other types of hydro get about 75% oxygen to the roots.