I would say it is a much better option than the high flow Pedrollo, mainly because of the electricity consumption.
2 x PC18 000 = 36 000 liters/hour @ 180 watts.
Even if you need a high head, you can use the PC36000 which has a head of 5 meters and on 2.5 m you will still have a delivery of 22 000 liters/hour @ only 280 watts. The Pedrollo can't match this.