Absorb Stamina, 25 points: 113 charges
Stamina Damage, 28 points: 112 charges
Stamina Damage is clearly inferior to Absorb Stamina. For the same number of charges (+1, actually), you do 10% less Stamina damage, but in exchange gain 25 Stamina per hit through absorption. Stamina being an important resource for any melee fighter or archer, that's pretty significant.
Also, I somehow have two Absorb Stamina enchantments memorized, meaning I can stack the same enchant twice on the same weapon. Has anyone else found any enchantment imbalances along similar lines?