I didn't see anything wrong with the darker binding but now that I've seen it done with the green binding I like that one so much better. I always audition my bindings. I usually will put the quilted item (quilt, potholder etc) on the back of a chair our couch where I can look at it from a distance and put it on whatever fabrics I'm thinking of with a narrow strip of the proposed binding showing. I then leave it there for a while so I can look at it multiple times and see what I want to live with. So many times the fabric that I thought I wanted for the binding ends up not to be the one I use.