Well, the GAP10 is a large frame AR (ie .308, .260 rem, 6.5 Creedmoor) verses the CTR02 which is a small frame AR (5.56, .204 Ruger, 6.5 Grendel). You need to decide between a large frame versus small frame AR, because they are very different in terms of caliber choice and capabilities. As far as quality, you can't go wrong with either. Both GAP and JP make outstanding products.
If you are looking into a large frame AR and are dead set on choosing between a GAP and a JP, look into JP's LRP-07 instead of their CTR-02.