Depends, Oryx relies on more people co-coordinating well which can be hard if they aren't people you regularly group up with. I got black spindle last night with 2 friends who I play with a lot and we got it on the 3rd try without too much of an issue. Oryx took us a few hours the first time. The black spindle mission is a lot more reactive though. Either way, it was still damn tough and definitely up there with the raid finale.