Which is correct? Well, it depends on your needs, your drapery needs that is.
A puddle, in the the drapery world, is when the hem sits on the floor... a lot. A pout is when the panels crunch on the floor up to 2". Skimming is when the drapery rests just on the floor.
So what do you choose? All three options have their own unique charm and each is suited to different situations.
Usually a puddle is best for stationary panels, as it is a more formal look. It can be arranged to appear more tailored. Once arranged, it is best to leave it in place. A pout is more casual. It can be arranged to look nice and is good for both stationary panels and functioning panels. It gives a fuller look without being messy. And of course panels that skim the floor are best for daily functioning use and can be dressy or casual. No arranging required.
See examples below.
Pout
Puddle
Skim