My two cents.....
I use REAL GEESE for field hunting and occasionally shallow water. We have hauled 14+ dozen, a cart, and two layout blinds in a Chevy Cobalt (my Son's) for fuel economy. THEY WORK! And on more than one occasion, we drew birds away from an 8dz. Full body spread.
For water & shoreline hunts, we use 16-30 floaters with one or two dz. Full bodys.
On some rare occasions, we have used4 dz. Shells mixed with the silos.
If I were to choose only one kind, it would be Real Geese silos
Lady walks into a bar with a duck, BARTENDER: "Hey, get that old coot out of here"
LADY: "That's not a coot, it's a duck!"
BARTENDER: "I was talking to the duck!"