Tough poll. I could actually check all the boxes depending on location, time of season, time of day, migration in the area or going thru and a few other lesser criteria.
Early in the season on big water I like large spreads. When the migration is going on I like large spreads but that is short lived as they usually go thru rather quickly then you're back to hunting locals.
When I'm only setting a few decoys, I like to use my mags or super mags. They can be seen from farther off is the only reason.
Late in the season I lke to set 3 - 5 decoys even on big water since part of the draw at this time of year is courtship and the other factor is very educated local birds that have heard a million duck calls and looked over a million spreads. At this time of year when birds are flying in 1's, 2's etc, having a big spread looks very fake.
Calling follows suite also.