Haven't ridden the JJ yet....but the opus is real good on groomers and hardpack. It's light and playful. Good swing weight and spins easily. Ollies nicely. Real easy to throw around in the trees. You can literally ride it as an "everyday" ski. I haven't had a chance to run it through any deep pow yet but that's what it's made for and I'm sure it'll shine there as well. From what I've been told about the JJ and from what I've read in reviews, it excels in deep pow....even better than the opus. It does everything else the opus can can do as far as groomers, hardpack, etc....just not as well. So IMO and this is semi unfair as I haven't ridden the JJ yet and am basing this off others, if your looking for a pow dedicated ski go JJ. If you want something that does pow but then also rips the groomers back to the lift, get the opus. Hope that helps and honestly I doubt you'll go wrong with either ski. They're both reviewed highly and I for one can tell you that the opus is my new fav ski of all time. Good luck.