I'll be darned: never heard that word for a spell before.
Since the Daedric longsword only has 18 enchantment points, I'd definetly choose a 'cast when strikes' spell: constant effect spells require far more points to be effective.
The thing about having it absorb health rather than do other damage is that it functionally can't be reflected onto you. Not sure why this is, but its true. True though, that you'll get more healing out of restore than absorb.
Overall, it seems to me that fewer opponents have shock resistance than anything else.
Honestly, with either absorb health or restore health [BE SURE, if using restore, you choose SELF: otherwise, you'll heal your enemies
] You'll be so 'uber' the game may not be as fun, even with the difficulty set to max...
Oru