Hide the layer with less color

@powerful_Zephyr5EF9 

Try the following script. It assumes the target layers are the 2nd and 3rd in the stack from the bottom. The colour of each target layer will be compared using Lab colour where the a and b values of zer0 = neutral. The layer closest to neutral will be automatically hidden.

/*
Hide Closest Layer to Neutral of Target Pair.jsx
v1.0, 24th December 2024
Stephen Marsh
https://community.adobe.com/t5/photoshop-ecosystem-discussions/hide-the-layer-with-less-color/td-p/15054871
*/

#target photoshop

try {
    // Ensure there are at least 3 layers, assuming that the target layers are the 2nd and 3rd in the stack
    if (app.activeDocument.artLayers.length < 3) {
        throw new Error("There should be a back layer and at least two additional target layers directly above!");
    }

    // Get the Back(ground) layer and the first two layers above it
    var backLayer = app.activeDocument.artLayers[app.activeDocument.artLayers.length - 1];
    var targetLayerA = app.activeDocument.artLayers[app.activeDocument.artLayers.length - 2];
    var targetLayerB = app.activeDocument.artLayers[app.activeDocument.artLayers.length - 3];

    // Get the average Lab color of each layer
    var labColor1 = getAverageLabColor(targetLayerA);
    var labColor2 = getAverageLabColor(targetLayerB);

    // Calculate the distance from neutral for each layer
    var distance1 = distanceFromNeutral(labColor1);
    var distance2 = distanceFromNeutral(labColor2);

    // Hide the layer that is closer to neutral
    if (distance1 < distance2) {
        targetLayerA.visible = false;
        var layerName = targetLayerA.name;
    } else {
        targetLayerB.visible = false;
        layerName = targetLayerB.name;
    }

    //alert('Layer "' + layerName + '" hidden!');
} catch (error) {
    alert('Error!' + '\r' + error + '\r' + 'Line: ' + error.line);
}


function distanceFromNeutral(labColor) {
    var a = labColor.a;
    var b = labColor.b;
    return Math.sqrt(a * a + b * b);
}

function getAverageLabColor(layer) {
    var samplePoint = [layer.bounds[0] + (layer.bounds[2] - layer.bounds[0]) / 2, layer.bounds[1] + (layer.bounds[3] - layer.bounds[1]) / 2];
    var sampleColor = app.activeDocument.colorSamplers.add(samplePoint);
    var labColor = sampleColor.color.lab;
    sampleColor.remove();
    return labColor;
}

https://prepression.blogspot.com/2017/11/downloading-and-installing-adobe-scripts.html