Chanel recently launched a new foundation, Vitalumiere Aqua. It's a sheer coverage foundation that is oil-free and feels very weightless. I've been using it for about a week now and I am loving this just about as much as I love the Nars Sheer Glow. I feel that these two foundations are very similar in wear. Both are great foundations for day, offer sheer coverage that, while do not completely cover my blemish scars, neutralizes them. Both provide a glowy, fresh, natural look that lasts throughout the work day.
In some ways I like the Chanel Vitalumiere Aqua more, in that after setting my makeup with a dusting of powder, the Vitalumiere Aqua immediately looks slightly more natural, whereas the Sheer Glow needs about twenty minutes for the oils in my skin to break through the powder. Also, the Vitalumiere Aqua offers SPF 15, while the Sheer Glow does not provide any sun protection. The Vitalumiere Aqua may also be slightly better for spring/summer since it's oil-free, especially for those like me who have combination skin. But, the Sheer Glow advertises that it contain ingredients that improve the quality and texture of skin, while the Vitalumiere Aqua does not mention anything about the effect on the skin.
The one noticeable difference, and this is slight, is probably the color. I am using Deauville in the Nars Sheer Glow and Beige Pastel B10 in the Chanel Vitalumiere Aqua. Deauville is described as a perfect balance between pink and yellow skin tones, but to me it is a tinge more on the yellow side, while the Beige Pastel is a true beige.
After considering everything, I really can't decide which one is better, or which one I like more. But I will say that I'll probably be using the Vitalumiere Aqua more and more as the weather gets warmer.