I did not and still don't like to play as whm (ok no it's so fun in DPS and whm is my favorite spiritbond class)
I come from a SCH background in 2.0

And dispite that I do like diurnal for the huge cast speed and the confort of multiple regen aspected helios + benefic and the tank is fine for 10 sec or more depending of his brain and view of CD
I found it easier to play in diurnal and trickier in nocturnal...
It's harder, mana extensive but you can do great and save so many lazy Ass...