I use Ghost Kill and Sun Move too.
But, I personally choose Ghost Kill because for me it actually suitable for any team I use, I also use Sun Move mostly when I change to Earth main or certain Fire main team
I choose Ghost Kill to focus on mostly because when I mood my ninja, I always choose between the Att+, Nin- or Att-, Nin+
Not a very good mood I know, because I don't feel like decreasing their defense/resistance when its already low. So, Ghost Kill actually helping me increasing whatever minus on that that ninja I use