A minor Vampire wit Nightfall(2+1 Attack) does with Adrenaline 12 Damage.
A Vampire with Eclipse (4+2 Attack) does with Adrenaline 12 Damage, too.
So Minor Vamps are useful with Nightfall and normal Vamps are useful with Eclipse.
When u could use Momentum to a vamp with eClipse you have a 7 Attack Vamp that does with Adrenaline 15 Damage^^