For omni-healer use, I'd meld either Crit or Determination with my bias leaning towards crit. Secondary differences don't matter too much unless you're looking to optimize at the extreme highest tiers of content and looking to achieve the absolute best numbers.

Quote Originally Posted by Seraphor View Post
Crit is prized for contributing to SCH's "Critlo" and AST has a similar mechanic with Nocturnal Aspected Benefic/Helios, so you can't go wrong with Crit for those two, and it will still be a bonus for WHM.
Just as an FYI, Crits increase the potency of your cures and thus increase the potency of shields, but AST doesn't have the same bonus benefits to critting their Aspected Benefic / Aspected Helios that SCH has when they crit Adlo.