The middle-aged woman was a cultivator at the second mortal coil. She was thinking about the two armors from the point of view of someone who could harden her flesh into stone with life force.
It was true that cultivators at the second mortal coil aren't afraid of blunt damage. They are not afraid of most types of damage, actually, and don't need armor, but piercing and cutting types of damage from a sword or spear are more effective against them than damage from a hammer.
He was still at the first mortal coil, so he overlooked that consideration. Now that he had been reminded of it, it helped him make up his mind.
He thought to himself, "My body is naturally tough because of my extraordinary nature. It is as strong as a cultivator at the second mortal coil, so I don't need protection against blunt damage."
