Well the taunt on Niuzao can be turned off just like with Xuen so it will probably still function the same in raid content. Just a DPS CD.
But blizzard seemed to be quite keen on that philosophy that a "worse, but easy and passive" option is good to have. So assuming they keep that philosophy, RJW will be sustained DPS/AoE DPS, and Niuzao will be a burst DPS, but less over 3 minutes perhaps than what RJW gives. Special Delivery does less but doesn't need any sort of management.
But we'll see if they really keep that philosophy going.