Either or is gonna work. If money and storage is no option as well as being able to drive into the field then id opt for FB. If you don't have a nice trailer, no off season storage and have to walk in then shells may be more in you ball game. You could also use silos in that case. You will kill ducks over all of these.
To be honest, FB honkers and a few spinners should do the trick. I think, in a lot of cases, not all, that you can kill just as many ducks over a honker spread with spinners, and then if honkers do show you don't have an all duck spread that they don't want to work to.
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