My answer is basically the same as Markus'. Buy both, I did. Kind of, I bought the Waterfowl Special and sent the frame back to the factory to be fitted with the shorter Turkey barrel.
Here was my reasoning, the Waterfowl Special with it's 32 inch barrel and Mod choke was MADE for big geese needing big loads of steel shot! The 24 inch barrel with choke tubes was made for turkeys. The shorter tube of the turkey barrel is better for woods type hunting while the 32 inch tube of the waterfowl gun works great for field/blind hunting geese. Added benefit, the turkey barrel has removable chokes so you can find a load and choke combo that fits your hunting situation.
Hope this helps.
Nixter
PS, a quick search of this forum will yeild a pic of a goose hammered by my Waterfowl Special. If you can't find it, I'll re-post it.