You'll get more opinions than you can handle on what's "the best". (But, aint it always that way when you're askin' about gear? <img src=icon_smile_wink.gif border=0 align=middle>)
I use Delta. They may not be "the best" ('cause who's to say what "the best" is), but they work for me. One of the hens I am using still to this day is one of their originals that I got about 10 years ago. It's been with me every season since then and still looks great. The new ones are made of an even tougher "rip resistant" material so you can expect them to last a while.
One modification I have made is that I put them on the "Buckwing" expanding decoy stakes. In case you haven't seen or heard of them they basically go into the decoy and expand like an umbrella when you open them. It takes all the creases and wrinkles out of the decoy for a nice presentation.
P.S.
Not a "Sceery" (or any other inflatable decoy) fan here! <img src=icon_smile_shock.gif border=0 align=middle>