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Well, you could say that they have the same number of facets (except for the horns and the crest) - that's true, but the helmet of the Archers has smoother facets, and it's not even about the shading. And they also have almost the same number of polygons (due to the crest and horns, the second one has slightly more).
For comparison
the Archer's helmet can't be smoother because it has the same height, width, and polygon count as the other one; they are identical. The problem is in the shadows. If you take a screenshot and remove the shadows, you'll get almost the same picture (not counting the horns and the crest sticking out behind the hexagonal hemisphere).
