I suspect Mischa will replace them himself for you, but since you asked...the 3rd gen rudders with significantly more surface area are better in light winds for maneuvering on the line, and while the 1st gen rudders do tend to cavitate a bit quicker they also have the lightest feel at speed. So, IMO it all comes down to what you want from your rudders. I am running 2nd gen rudders just because they seem to be a good comprimise between the two extremes.