The main difference is the HD has less Chromium and a little more Carbon. The result is it will show some patina if you don't keep it clean and dry. The upside is it holds an edge slightly better. The differences are minor between the two and they're both excellent lines.
The Funayuki/Gyuto is a blade style I asked Konosuke to do. They slightly flattened out the edge so there is more board contact and the knife is a little better for push cutting because of this. Not a big difference between it and the regular gyuto.