As far as JoW over JoC. Well I suppose I'm lucky we have a solid ret paladin in our guild who brings a lot to the raid including Imp JoC. It does seem to help the raid dps quite a bit overall.
So I am generally free to place whatever other Judgment on the raid boss that I entirely selfishly choose to need. I do use a fair amount of Light or Wisdom. I admit when I decide to use wisdom it has always just been for myself.
Though I will admit a few weeks back I scanning WWS logs and saw just how much mana it really does help the raid with. Since then I do try to keep it up when I can if the fight allows for it, and am trying to be less selfish. ^^
The amount the shadow priest restores is very heavy on the their skill & gear. In our guild we have I feel a very well geared shadow priest. Looking in the WWS log last week in VR (last fight I had JoW on for nearly the full fight) she gave 61k mana to her party. My JoW gave 53k mana to about 60% of the raid. So certainly no small amount.
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guild: http://www.neltharionsfury.com/

