Honestly I would do some thing that was an allover. There is realistically no way to make sure everything stays lined up to match front to back.
Also I would be a tad worried about all the seams you have that are on top of each other (although the batting is in between). Are you quilting it on a longarm or a domestic machine?
Personally I would make this into two qullts because both sides are so beautiful and I personally don't think any FMQ styles will look good on both sides. In the end I think you have to pick one side and quilt that side the way you want and just deal with how it looks on the other if you keep them together.