I think the obvious answer here is to choose the pumps that are best suited to your tank size & shape, perhaps it's a combination of the two. For eg. my tank is almost cubed at 30x24x24 so the slower broader flow of the vortechs makes sense for me (I've got an MP10 on the back wall and an MP40 on the side wall). I need the flow to fan out quickly after it leaves the pump. In a longer tank maybe you'd want the punch of a Tunze to get water movement further into the tank.
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