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[LucasDanzinger · Accepted solution]

I'd suggest you use the QML Connections type - Signal and Handler Event System | Qt QML 5.8 

Connections {
    target: spanFeatureLayer.featureTable

    onQueryFeaturesStatusChanged: {
        if (spanFeatureLayer.featureTable.queryFeaturesStatus === Enums.TaskStatusCompleted) {
            console.log("complete");
        }
    }
}
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[LucasDanzinger]

The 2 should be pretty comparable, although I should note that we don't have any performance benchmarks in place for this scenario.