I've read back through this comparison before on here.
It seems most favor Pentair Intelliflo VS over Hayward Ecostar, even though efficiency tests show Ecostar a clear winner, at least, from the settings used in the test:
3450 RPM
Intelliflo: 97 GPM, 2720 Watts, 2.14 Gallons/Watt-hr
EcoStar...