I want to compare these thoroughly, because TOW has so many overlooked advantages IMO.

NS:
  • Ability to reliably kill at least one opponent.
or...
  • Ability to panic heal yourself.

TOW:
  • Long lasting high, unpredictable damage output.
  • Ability to kill lots of people for a long time.
  • Mana efficiency - triggers Clearcasting more often.
  • Increased healing, both from yourself and your healer.
  • Holy Paladin gets much better mana efficiency.

I don't see why people rule out TOW so easily for arena.. it has SO many awesome advantages.