Heh, I would say go for the Cerises Speedy ... but it might be a bias opinion because I just bought one because I fell head over heels. LOL
Also, the cerise is a discountinued line and will be harder to get in the future as oppose to the denim. In case you ever change your mind -you could always get the denim later.
However, they are in some sense two very different bags. One is made of canvas and the other of denim fabric. So, it's entirely up to you. The best choice is to get BOTH, but at different times. =)