ONE PUMPWITH BRACHES OF THE PIPING EACH WITH IT'S OWN BALL VALVE CAN CONTROL WATER FLOW AND CIRULATION AS WELL AS TWO PUMPS CAN.Again, the 2-pump idea will give me more control of each
LESS ELECTRICAL RUNS .
more complicated plumbing job
easier to maintain possibly cheaper to buy
easier to plumb
easier to have areas circulate
When one pump fails you have time to get a new pump and not a fire drill to replace it. and in todays bull that's a huge plus