I dont think that it makes a huge difference on Vet…
I Play the selfheal trinkets on my tanky classes cause they shoudlnt get high dmg anyway,
on the others i Play the medikit dual heal trait…dunno ist Name right now, it says “when u heal a mate with medikit u also get healed” this is really awesome, because heals gettin scarcer and being able to stabelize mate and selfheal rocks