I have both the Shigefusa Nakiri and Watanabe Pro Nakiri, both in kurouchi.
I almost never reach for the Shigefusa (I've been meaning to sell it). The Watanabe (atleast the pro) is a much better knife. The biggest difference is the geometry.
Watanabe tapers immediately from the spine with a nice high bevel while the Shigefusa tapers really late. The other reason to go to Watanabe is his is taller than the Shigefusa. Being taller makes a nakiri much easier to use.
Both sharpen up well, but overall the nood goes to Watanabe.
I think Shigefusa's kurouchi line, in general, is a bit thick and late tapering. His Kasumi stuff is great, I have is kasumi gyuto, but I'm not fond of his kurouchi stuff.
It's a MANkiri!!