Used ones. IMO, folks care wayyyy to much about decoys. Number and placement definitely matter, but the details of the paint or quality of the plastic wont matter (aside from leak durability).
If you cant buy used, I think the GHG hot buys are good value. I've painted these things with spray paint into a bunch of different species and killed ducks over them.
Don't over think it too much and good luck!
This! Heck, Clorox bottles painted all black and some black & white will pull ducks in. Decoys are like fishing lures - designed to attract customers...
I can assure you, if you do a scientific study, realistic decoys vs painted bottles, the study would show you will decoy more birds with realistic decoys. I hunted for years and never shot a pintail until I got pintail deeks, then I started consistently decoying them. And skittish birds, that circle and circle and never commit and you are scratching your head wondering why they are not committing, hunting over painted bottles would be the first thing I would change.
Now if you are hunting small private pond loaded with birds, you don’t need any decoys. You would probably kill more birds with no decoys than painted bottles tho.