I prefer the green version actually, I think it looks more 'designed' but I also think that 'caw' has a good point about color blind individuals. Also, the wording under Happy Staff = productive Staff doesn't stand out as well on the green. Personally, I am at the point in my own endeavor that I think we spend too much time second guessing ourselves when an A/B test can answer so many of our questions! You might try that.