I prefer the purple.
You've got this whole inter-connectedness (yes, I know that's not a word) going on with the stars.
They're attached N/S and E/W.
I like how the purple will connect them all by framing the whole top.
Otherwise, they're just floating in space, and while that sometimes is a great look, I don't think it fits this quilt.
After the purple border, more of the green fabric. That light fabric (pink?) in the border just pulls attention away from the stars in the blocks.
Lovely piecing!