That is a really nice pattern, and your former quilt turned out great!
I think your choice depends on what effect you want from your focus fabric. To me, the darker green completely changes the look of the focus fabric, bringing out the blues and the background. It no longer looks very warm or very green, to me. The lighter green makes the focus fabric seem much greener, and gives everything a very spring-like feel. I'm partial to spring greens, so I like the look of that combination better. With the other choice, you're going to have a much higher contrast, cooler quilt.