They halo is the most different from the other two, whilst the El Rey and the AR7 feature traditional camber, the halo is a rockered park ski. It's also worth noting that the halo is softer than the other two. Personally I would go for the halo of I was hitting jibs and smaller features. However for larger features I would want the stability of a camber ski with a stiffer flex. Unfortunately, I haven't had the chance to get on these skis, so that's about as much of a comment I can give.