The RP set is pretty good, but the CM set is pretty average in terms of how good it is in the current Meta. With offense being so dominant right now, RP and the Protect set is the best ones you can run right now. The fat teams Calm Mind breaks aren't just common enough.What do you guys think of Mega Diance? I've had some fun using the RP set, which is pretty awesome- many teams a re prepared for Mega Diance, but not all of them are prepared for one that can Outspeed their scarfed Keldeo. My problem with it though is that it's actually quite frail in its Mega form as well as being a deadweight when Scizor is on the opposing team (I don't run HP fire) And also being able to be picked off by Azu with the least bit of prior damage. I haven't used the CM set, but I have contemplated the use of a double dance set with CM/RP/Moonblast/Diamond Storm or Earth Power. I don't know how this would work, though, since it doesn't really like giving up any more moveslots. The RP set works amazing with Magnezone/HP fire lure Kyurem-B, which can weaken Ferro and, hopefully, get rid of Scizor. I honestly also just like the RP set because it has more power, being able to fully invest in special attack as well as use a rash nature, and you can invest a little more in attack.
A double dance set is really subpar as it needs as many slots it can get to be as effective as it can be.