Triage
Triage increases healing received from all sources. It may fit a character prioritizing healing effectiveness, whereas Vigor increases Health itself; the sources do not rank the two choices.
How it works
The Traits source says Triage increases healing received from all sources by 5% per Trait Point invested, up to 100% at Level 20. The effect is about received healing, not the character's Health pool. Vigor has a separate listed effect that increases Health.
When it helps
Consider Triage when you want healing sources to restore more Health. If you want a larger Health amount instead, compare Vigor; the supplied evidence does not establish a universally better choice.
The tradeoff
Triage affects healing received; its documented effect does not increase the Health pool itself.
Your next step
Decide whether your priority is the effect of healing or the size of your Health pool, then review Triage and Vigor.
Read the supporting references
Check the edition and source version for patch-specific details. Guide methodology.