Pump advise

[dockrat]

I need some advise on picking a return pump… should I use a larger External Water Pump ( in thinking Pan world ) Feeding my return and chiller/reactors thru a manifold, or should I use 2 Mag drive pumps submersed in the sump… one dedicated to return and the other feeding the chiller / reactors… Im tight for space in my tank stand so that’s why I am considering the mag drives… I guess the questions I have are… what option would be Quitter ? What are the down sides to running 2 pumps in stead of one?

Kris