I would just go with the bag that you like more, whether that's based on photos or seeing them in person. My advice would be to stop concerncing yourself with resale value. Unless you feel super confident in your fashion/trend skills, it can be hard to determine which pieces will hold their value in the long term. Plus, the vanity pm is a new piece. For all we know, it's going to be permanent and that will affect its value. Most seasonal pieces have the highest resale value within the first 6 months of release.
Furthermore, if resale value is most important to you, you're better off purchasing some Chanel or Hermes styles, and even then it takes about 10 years to get the initial return.
Agreed, agreed, agreed.
I do love that the Vanity has got more add-ons, like the tag and the beautiful chain and at a lower price point. The Cannes seems more plain in comparison. Yeah I'm struggling with loving the Cannes to be honest. I love looking at it and think it's gorgeous, but not sure if I love it on me.
Sounds like you don't really like the Cannes, so you should probably choose the Vanity PM.