Personally, I prefer Psituned Vitality because it synergizes better with Psychogenic Vim. It also synergizes with other % heals like TIKA or Medical Milkers.
I think Psionic Shielding synergizes better with Vitality Siphon because it provides an additional buffer = your level each round reducing the amount you have to heal. Theoretically, Vitality Siphon gives unlimited healing, but I think it's Energy regen is way too low to be practical. Maybe it's better now that Entropic Leech scales? Kineticist does have Debris Field for Blind.
However, I have two Kineticists and the one with Psionic Shielding is doing just fine.
