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Nebula is much more effective than Spectre. It can give a health, mana and damage boost. With it you can regenerate extremely fast and deal really high damage. You aren't restricted to magic weapons. It drops these boosters even if you kill enemies with meele weapons.
The buffs on Nebula are especially potent at level 3.
Basically you'll outheal Spectre Hood with the health regen buff, outdamage Spectre Mask with the damage buff, and the mana regen buff makes it easier to keep the momentum going.
Plus the buffs can show up on any damage type, not just magic.