Replying to K2 Shreditor 102 vs Salomon Rocker2 100

Hey NS, I am looking for some advice. I own both of these skis, the k2s are 170cm, and rocker2s are 162cm. I need to decide which ski I should sell. I am 15, 5' 8, 140lbs, and I ski at Killington (ice coast). Both pairs are brand new, so I want to decide which to sell so I can get more money when I sell them because they are unused. I plan to use these skis to ski on trail and a little bit in the park. I ski pretty fast but I am not good at park whatsoever. Has anyone used a pair and had any impressions? Thanks