I agree that the chain strap can't be too comfy if the bag is full of stuff but I still have to vote for that one because it's so classic looking and gorgeous.
I can't decide...I prefer the MP, but I don't like the chain strap. I think the Sienna would be more comfortable to carry around all day. MP is timeless, though, so I vote MP!
i think it depends on what you're going to use it for...i think the MP is gorgeous but for every day i would get the sienna. love the color of the sienna too!!