I have never bought the NARS body glow, but I've tried it in the store and have a similar product from Victoria's Secret. I rarely ever use the VS product, because it dries sticky and gets on your clothes if you sweat. The Body Glow from NARS, when tried on in the store, made my skin look a little red... just like the VS one did. The Illuminator is much better.
I haven't used the other product, but this product is totally gorgeous on the body. You will have many compliments on your skin. Wash your hands well after you have applied to your body. This products does NOT transfer onto your clothes. Gives your tan a healthy, beautiful glow. Worth every penny!!