Which one brings the most health per second (at equivalent healing power stat)?
Here is a list of all the passive regeneration skills and traits that I can find on the wiki. The criteria for this list is that the health must be regenerated by simply having the skill or trait, without an active effect or condition. This is why traits such as the Theifs Shadow's Rejuvenation did not make this list.
Skills and Traits
So which is best?
Let's take a Healing Power of 100 and a time of 3 seconds.
Virtue of Resolve,
Signet of the Wild,
How does this compare to Regeneration?
The Warriors Healing Signet gives the best passive regeneration.