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I've used both, and I prefer VG-10 in every respect. Both will get scary sharp and stay that way for a while. The ZDP will stay sharp longer, yes, but to me it's not worth the extra money and difficulty in sharpening. We're not talking about twice the edge-holding; it's a pretty small increase in my observations.
I've found VG-10 to resist rust better and is easier to sharpen. My VG-10 Delica is a much better knife than my ZDP Delica, to be honest. It's cheaper, easier to sharpen, more corrosion-resistant, and holds its edge for a very respectable amount of time. That little edge-holding doesn't justify the higher price to me.