Dragon Scale is slightly more flexible than steel, but much more durable, making it the perfect material for armor. Normally, it may not compete with refined gold, but it should definitely surpass Mithril, as Mithril's advantage lies in its lightness and flexibility, not its strength.
As a Red Dragon, Leon, who naturally possesses Dragon Scale armor, honestly doesn't care much about armor; he cares more about acquiring a powerful weapon to enhance his combat abilities using the Sword Control Technique.
In this case, Mithril is never the material for making good weapons, it only reduces the weight.
Refined gold, on the other hand, is different. Weapons forged from refined gold possess immense destructive power, and if crafted by a skilled blacksmith, they might achieve special effects... Of course, refined gold weapons have a drawback: they are heavy, but that's unimportant to Leon, who is very strong.
