Marc Jacobs or YSL?

I feel as though the YSL is more of an everyday bag where the Stam is a little more dressy because of the chain strap-very Chanel like. Good luck deciding-that's a tough choice.
 
So I'm contemplating my next purchase and I am torn between a Marc Jacobs Stam or a YSL Muse. I have loved both bags for so long (both are on my wish list) and I cannot seem to decide! Please help!

Ohhh, so lucky
I have been oogling Muse for some time now.
Overstock.com just got some more in and I was absolutely mesmerized by YSL. I can not afford it, although, if I sold all my other lovely bags I would be able to buy probably 5 of YSL