You'll get both answers. Discus typically like slow, constant moving water, as that is present in their "natural" habitat. However, you'll see quite a few people say that their discus love the flow from the return hose/overflow and use it as a treadmill at times.
My discus love to swim around in the flow from my powerhead/pump combo, but can get away from the water movement by hanging out behind the tall plants next to my overflow box.
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