I'd say that any of these colors are good, I'm a sucker for solid colors like these. But I also think that the green one goes with the brand values you're trying to convey.
I've scaled down the arrow a little bit in #179 and #180, and in #181 I'm just showing you how the arrow looks like by itself, and how it could become the standalone icon for Trendist -- the "Trendist arrow", if you will.