I have both (in different colors), and if this is your intention, the prada all the way.
I have a light-colored saffiano tote that is my favorite summer bag. it's so light and easy, in the summer carrying heavy bags seems harder.
also, with the saffiano bag I have zero problems with color transfer. it's such a durable and beat around type leather. the celine luggages are a very soft, fine leather, so in a light color it's going to be susceptible to both color transfer and simply getting dirty easily.
I am so glad to hear the saffiano is durable. I love it in the light cameo and sabbia but was unsure. So you have not had any issues with color transfer? Do you feel like you have to baby it more then your black bags?