So, to be clear on what I've been using....
All the 3V or D3V that I've been using has come from Survive!Knives. Which is why I keep using words like supposedly in regards to D3V. I know those guys aren't regarded well around here (nor by me anymore... you can see my opinion of them over in the Good, Bad, and Ugly). But, I got these before I got smarter. So, that being said, for all I actually know, the "Delta and 3V" that I've been using could be 154CM or something, for all I can actually trust.
Experientially, I have seen no difference in edge stability, nor corrosion resistance, between D3V and 3V. None of them have been left out in the weather, nor put up wet. None have exhibited corrosion or even staining. All have about the same edge geometry and sharpness, and I haven't seen a bit of difference between any of them in either edge holding or edge stability. None of them hold a really keen, razor edge any better than any other one, and none of them seem to hold an edge any better than the INFI I've had.
So, there are all the cards. 3V is ok, D3V is ok, neither of them stand out as a phenomenal steel, nor even a great steel, so far. Just.... steel. And both are harder than INFI to get back to a really keen edge.