I liked the green edge more.
I'm finding the new version usable-- the green edge might allow for faster scanning, but the new version isn't bad with a little practice.
On the other hand, if there are multiple new comments in a thread, I find that I miss the alternating white/pale blue way of distinguishing comments. It would be nice to have two pastels instead of one.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.