Best Unit to Sacrifice?

[iregev]

you should try to sacrifice without losing the units there are many ways to do it.
- Vampires and anceint vamps can restore their life back (before patch 1.7)
- sacrifice with low inteliigence + giants (who can be healed with shamans)
- double sacrifice + timeback
- sacrifice + hypnotize (or demoness seduction)

and finally you can resurrect your fallen troops with Inqusitors and spell.