Stats : WHM MND>DET>VIT for PVE PvP MND>SS While running esuna is v handy
Same for SCH PVE PvP go with PVE build

As a WHM I V rarely run out of MP, unless I have to raise quite a few people, but even then. I will Divine Seal Regen main damage takers, Virus and E4E them then pop SoS if I am immensely low, but tbh you should be popping SoS when its up unless you know you have huge heals coming up.