[Miller]

Unless I am mistaken, Standard Mechs get the best armor in the game, as it is very high Armor, and Magic Armor, counts as Unarmored (making it work good with MA or Kensei) and also gives 2xlvl bonus HP (+120 at lvl 60)

of course I may be mistaken.

It has good stats and bonus HP on top of a trait that grants armor, although most of the HP is to make up for the lack of enchantment slot. It's good, but calling it the best is still a bit of a stretch in my opinion when options like Body Guard, Mayelia, Terrasque and et cetera exist. It's a good budget/statstick armor set for sure.