Personally, at the beginning I used Blessing of Light thinking the extra boost in defense would benefit my team for their next encounter.
After a while I started using Weapons of Light and it wasn't until playing Iron Banner where I noticed I wasn't only getting more score but my team has a better chance with fire fights.
I'm tempted to experiment with Armor of Light for the occasional enemy jumping in with a fusion rifle or a shotgun.
Thoughts?
Edit: apparently everyone has Saint 14 haha
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I feel too much like a sitting duck with armor of light, so I use blessing of light. With AoL, you never get more than one or two guys to sit in there with you, but with BoL, I've been able to give my entire 6-man team a buff, and it allows them to spread out, decreasing the chances of getting nova-bombed or fisted.