I had a chance to stop by the boutique since I PMed you. I played around with Deborah & Eva for you & Emmy. =)
Deborah (open-top) is very comfortable on the shoulder; the straps are flat, plus, they are adjustable. I'm surprised by its weigh, it's too light for an MJ bag. I saw Tote (the longer version) in Navy, it doesn't jump out at me; Navy works on Venetia. White, on the other hand, grabs my attention. MJ stores haven't received the Lavendar version yet so I can't tell whether it will look even better than White.
Style wise, I like Venetia the most; it looks very sophisticated and elegant. Blake is smaller so it is a good choice for someone with a petite frame. For a comfortable shoulder bag, Deborah wins. =)