What about getting both? they are different enough to justify purchasing both.
Charbon is probably more suitable for everyday wear since it is darker so won't pick up dirt as easily (I actually have just ordered one today). But Noix is also a great colour - maybe just need to be more careful with colour tfr or dirt and stuff..
I have a Charbon bag and it's a very versatile chocolate brown that you literally can wear with everything. Because it's dark, it's easy to keep clean. And it looks great with any hardware!
I love noix and there is not a colour it doesn't go with. It looks great with black. I find some of the darker browns are only so-so with black and not great with navy or grey.
I had a 09 praline mid day tote. I got a lot of compliments on the color, I actually had it with GSH, it was really pretty but it was very light and the handles started to show wear after only a few times carrying it. I love noix.