It all depends on how you want your system set up. For me and my tanks, I prefer to have no/as little as possible equipment in the tank.
On my 72G Bowfront, I have the ehiem 1262 in my sump. It supplies a SCWD that has a eductor on each output. That is all that is seen in the tank, 2 eductors and they can barley be seen as the background is black, same as the eductors. That's all the flow in that tank.
For my 400G tank, I have 2 Hammerhead pumps, over 5000GPH each. One is my return from my sump and it was set up in a manifold over the top back into the tank. I'm changing that to go into a OM4 way with a output at each corner so that I can have some wave action in the tank. I have a 30G and 90 G sump on the system. Beleive it or not, with over 5000GPH flow in the 90G sump, I still run a small powerhead in there to agaitate the surface, otherwise it becomes stagnant. The input to the sump is in a sectioned off chamber so I guess it's impeding the surface aggatition.
My other Hammerhead is on a C/L that intakes from 2 ports in the bottom of the tank and returns out 4 jacussi jets in the side of my overflow box. I'm going to be changing that a bit by adding pipes and eductors to run behind the rockwork and increase my flow.
If your interested, I do have a Sequence Baracuda pump available for sale as I'm not going to be using it. PM me if interested.