What is a good nagura for dressing/smoothing 8k and higher grits that are in the 'harder' synthetic stonne range? King 8k nagura vs the naniwa nagura? I see naniwa offers a wider range of nagura in different grits, but they are a little pricey, but you do get more nagura with the naniwa vs the king. Which is better? Are the naniwa's nagura softer or harder than king ?