function parallelepipedSpace(a, b, c) {
    return 2 * (a * b + b * c + c * a);
}
function parallelepipedVolume(a, b, c) {
    return a * b * c;
}
function isEqual(a, b, c, a1, b1, c1) {
    return (parallelepipedSpace(a, b, c) === parallelepipedSpace(a1, b1, c1)) &&
    (parallelepipedVolume(a, b, c) === parallelepipedVolume(a1, b1, c1));
}
function isBiggerBox(a, b, c, a1, b1, c1) {
    var box1 = [a, b, c];
    var box2 = [a1, b1, c1];

    for (var i = 0; i < box1.length; i++) {

        if ((box1[0] >= box2[0]) && (box1[1] >= box2[1]) && (box1[2] >= box2[2])) {
            return true;
        }
        box1 = [box1[1], box1[2], box1[0]];
    }
    return false;
}

//(1st box  1st side, 1st box  2st side, 1st box  3st side, 2st box  1st side, 2st box  2st side, 2st box  3st side)
function comparison(a, b, c, a1, b1, c1) {
    if (isEqual(a, b, c, a1, b1, c1)) {
        return "Boxes are equal";

    } else if (parallelepipedVolume(a, b, c) > parallelepipedVolume(a1, b1, c1) && isBiggerBox(a, b, c, a1, b1, c1)) {

        return "The first box is larger than the second one";
    } else if (parallelepipedVolume(a, b, c) < parallelepipedVolume(a1, b1, c1) && isBiggerBox(a1, b1, c1, a, b, c)) {

        return "The first box is smaller than the second one";
    }

    return "Boxes are incomparable";
}

console.log(comparison(1, 2, 3, 3, 2, 1));
console.log(comparison(2, 2, 3, 3, 2, 1));
console.log(comparison(2, 2, 3, 3, 2, 3));
console.log(comparison(3, 4, 5, 2, 4, 6));

console.info(comparison(1, 1, 1, 2, 2, 2));
console.info(comparison(1, 7, 1, 2, 2, 2));
console.info(comparison(1, 2, 1, 2, 1, 2));