It's not really an either/or! LED masks and RF technology compliment each other well.
Red light technology uses the power of light to supercharge the mitochondria of the cells making collagen and elastin.
RF energy uses gentle heating to stimulate the skin proteins. The high frequency electrical current produced by RF electrodes flows through the skin, resulting in a controlled rise in temperature and contraction of the dermal collagen. This produces a tightening effect as well as stimulating skin remodeling and deposition of new collagen and elastin over time.
So by combining these technologies one gets to take advantage of different mechanisms of action.
The LED mask is a little easier to use in that you strap it to your face for 10 minutes and the NEWA device requires one to be active in the treatment by massaging it in circular upward strokes.