Tigercat,
I do not have any experience with a 29 foot Fountain, however, I have had experience with a 34 foot. For the last 3 summers i have owned a 336 Grady and my cousin has a 34 foot Fountain. They are 2 very different hulls, one is for speed (Fountain) and one is for rough water / comfort (Grady). The Fountains have a narrow beam which increases speed but loses stability (9 foot beam on the 34 Fountain) Where the grady has a 11 foot 8 inch beam on the 336 which is quite a difference. In rough open seas the fountain can not keep up to the grady as he can not use his horsepower (triple 300 mercs) with his hull. Very nice boat, the fit and finish is no where near the Grady.
Every hull is a compromise!
Fountain = Speed , looks, fishing
Grady = Comfort, quality, fishing
My opinion.