Normally, I prefer a smaller spread of ultra-realistic decoys. Less work/less time putting out & picking up. More room/less weight in the boat. Not the usual four dozen that everyone has in their spread. They work for me.
At certain times, though, we will put out a mega-spread of 300 or so duck decoys. In that case, it means ALL the decoys go out; the cheap Hot Buys AND the Avian-X's and ProGrades....a little harder to handle, and a little harder to get birds to land where you want them to land...but sometimes it's the best way to get 2-3 limits.
Every day is different and only experience will tell you which type of rig will be most effective; you can't just say this
way is always the best, or that
way is always the best. Some days/places one rig will work better, other days and places other rigs.
Small ponds, small openings in the marsh, sloughs, etc. can't take 7 dozen decoys. In those places, 10-18 top line decoys will be best. Edges of large reservoirs, or large open marshes, and 6 dozen birds might not be enough. There are just too many variables.
You'll be better able to make the right call as you gain experience.