I prefer a loop on one end and the wt on the other. Sliding wts are a pain.
What makes them a pain? Seems like a good design. I haven't done it myself though.
Having a swivel that attaches to the decoy with a loop at one end of the line, and a stationary weight at the other is the best way to do it. The decoy slides and not the weight. There is no more pulling the line out of the water and getting your hands wet finding the loop at the bottom.
All you do is lift the decoy a couple inches out of the water, and clip your carabiner through the loop that is at the top of the line by the decoy's keel. Drop the decoy back down on the water. Then, as you make your way to the next decoy, the decoy you just clipped on slowly slides down the line as it sits on the water. Much faster and you don't get your hands wet at all.
The sliding weight design is the original way of doing it, but like many things in life there is a better mouse trap available (stationary weight design in this case.)