I just got the navy from Diabro and it's in my siggy. (Unfortunately, I bought it BEFORE it got marked down to the amazing price it's at now, so I paid about $100 more than everyone else.) It is a REALLY nice color. I think it's really versatile in terms of going with lots of different outfits/color combos. I have never seen the mousse IRL, but grey in general seems more difficult to match, and also slightly more likely to get dirty. I can't imagine you could go wrong with either, though! Or just get both! LOL!