I love both skirts but I can see why the second may be better, plus the fabric seems to be thinner. It's too bad that it was not a NAS item.
I also have the first skirt which I love but I wish the fabric was thinner and also that it would let me take big steps which it doesn't because of the gathering band above the ruffle. I wonder if the pleated skirt is better in that respect, plus it looks more fun.
The gray one has its use though and can look a bit more conservative, which may or may not be needed.