The Kongo is a battlecruiser. But, with upgraded main guns it has the same Heavy Attack and Heavy Piercing as the Nagato. And, at the cost of 1 Armor point (25 vs 26) you get more speed (30.0kn vs 20.0kn) AND more Health Points (385.0 vs 367.5). I'm confused as to why you would have higher Health Points with lower Armor, but I'll take it.