I asked the same question earlier in the year and the consensus is that most people put new supers on top, for convenience if nothing else. I need to add some supers tomorrow and I'm going to put them under the full/filling supers, just to see if the bees will start using them faster and draw the comb quicker. I need some drawn comb and time is ticking.....
I have done it both ways and my experience with it has been if they are working a super they will pretty much finish the one they are on before they go to another super. Whether above or below. I have had um walk through a super on foundation to get to the super they are working. Drawn comb is different they will fill it regardless where you put above the brood area. Just put a frame or two that they are working in the middle of the foundation.
Doesn't matter where you put drawn comb, and they will tend to ignore foundation until all the drawn comb is full. Definitely put a couple drawn and capped frames in a new box of foundation, that usually helps them get interested in drawing it out. Otherwise they may just walk right over it for weeks, or just chew it full of holes.
With a booming hive and a strong flow they will draw it out pretty fast, but not as fast as they fill drawn comb. Guard that stuff!
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