I killed a limit of ducks last year in less than 2 minutes. I was using a dozen, 12 year old G&H decoys and 1 robo duck. It almost sucked how fast it was over. Being in the right spot, understanding the wind, being there early enough, being concealed, knowing when and how much to call, is way more important than which decoys you choose to buy.
And for "the fish", I was using my 20. LMFAO!!