HP Steal and HP Absorb

[gqzpower]

Hello,

I'm new here i was invest allot of hours reading guides from EU server and US server, but i see allot of expired guides.

Reading on the web i see that is better get a set with HP steal and HP absorb before the Def.

I want understand how work the HP absorb and HP steal.
I have a gloves of absorption 5% HP steal with 1 slot of 2% HP steal, Amulet of Vampire +5, and 2 ring of absorb with 5% HP absorb.

I see that i no need recharge constantly, it is NICE, but some time don't see that my character is recovering when hit.

Some can explain me the formula of it?
What is better HP Absorb, or HP Steal?