I have both. I love the look of the purple the best, hence why I voted purple. But I much prefer to play games on the kiwi green.
That seems a bit odd?
The problem with the atomic purple, actually playing it, is the screen is dark, the color is dark and transparent, and in an ill lit room it actually makes the screen harder to see. This is not a factor with the kiwi green. Not sure if it's because it's a brighter color or because it's not transparent, but it just seems easier on the eyes. But just sitting on the shelf I much prefer the purple. Hence the vote.
And before anyone asks, this has been tested on multiple GB colors, so my purple one is not damaged, screen tint, etc.