Personally
I think the Kenmore Catalyst design was better at saturating all the items, mixing the detergent solution, pretreating the stains with the detergent solution, and potentially removing some of those soils before the wash even started.
The EcoActive system is beneficial in different ways. The load was showered with a concentrated detergent solution at the selected temperature. This would allow for highly active enzymes and good stain treating and removal. However, there was no fast spin type motion of the tub to recirculate all of the solution and ensure all items are completely saturated. Though, this was make up for with additional soak time.