I do not have numbers, but I have suggestions.
This question is best answered with the following info..
What class?
What play style?
Overshield, frost armor, or wovenmail are better for aggressive play like that on a consecration/melee build on a titan or dodge punch hunter.
One is regenerating health.
The other is continuously giving you damage protection.
If you are in the mix chaining aoe by slams or punches the orbs are falling at your feet, and or paired with powerful attraction, pulling the orbs in.
You would want facet of blessing on said build thus regenerating health on said melee kills AND then you are also gaining an overshield, frost armor, or wovenmail at the exact same time.
If you are a more patient player, your probability of getting an orb go down since they mainly land where the enemies are outside of orbs generated by supers.
Here, health regeneration would be more important.
One note I left out of the equation for you…
Also do not forget your leg armor mods such as recuperation or better already.
Albeit the return is a little smaller, you would be getting health regeneration off of those same orbs that are getting you overshields.
You are welcome.
I hope it helps.