One thing that bothers me about armor is the way only two of the companions have better than light armor proficiency. And one of those is already wearing the best armor in the game at the start.
So there's not a lot of upgrade potential when it comes to armor. Get the Scale Mail +1 (and drow armor for the light proficiency) and call it a day.
There's not a lot of point to the other armors, like The Oak Father's Embrace medium armor. The AC isn't high enough to make it worthwhile. It doesn't compete with the Scale Mail, not to mention the downside of taking extra damage from beasts. (Which I think is nicely balanced with the undead benefit, but not at the AC loss in comparison to Scale Mail.)
