When I spoke to Stacey at GM earlier this year he said while the 25 was a nice hull, it just doesn't compare to the 26 in ride, handling, economy, etc.... He designed the 26 himself. But then again a new 26 is well over a $100k and a used 25 is pretty short money in comparison to even a used 26.
The 26 is a modified 25, mainly it was lengthened, the sides of the boat were raised an inch or 2 which you can easily notice when comparing the 2 hulls by the flat area under the rub rail, and the entry was changed to help in a following sea, Stacey really knows his stuff and is one hell of a boat builder. He deisigned the boat himself by taking the best aspects of all the downeast hulls and putting them into one. Cotty Fay, who Stacey regards as one of the best NA's, worked with him on making the changes.