This bag is so pretty in every print, especially in the PM size. I agree with the others, if you have an Eva in Mono, it would be redundant to purchase this in mono. I'd choose DA or DE, depending on your wardrobe and preference.
If you already have Eva in mono then I certainly wouldn't get this in PM mono. They're way too similar. I'd suggest going with the MM so you have a bag that holds a bit more than your Eva and get it in Damier ebene (brown checker) or Damier Azur (white checker). Good luck with your choice.
I'm biased because I'm not really an Azur fan since I am afraid of color transfer. So even though you have the Eva in mono, I vote mono. Unless you consider the DE? Then I vote for DE over mono. The Favorite seems to be a favorite in all prints