How to query Popular Products and Featured products in same loop

I’m trying to query for best selling products (popular) and featured products using one loop. And, potentially being able to add an identifier to each product –as a class– to be able to filter them.

I’ve been able to query for the featured products like so:

$args = array(
    'post_type' => 'product',
    'post_status' => 'publish',
    'posts_per_page' => 10,
    'meta_key' => '_featured',
    'meta_value' => 'yes'
);

And for the Popular Products, this:

$args = array(
    'post_type' => 'product',
    'post_status' => 'publish',
    'posts_per_page' => 10,
    'meta_key' => 'total_sales',
    'orderby' => 'meta_value_num'
);

Using this loop:

$loop = new WP_Query( $args );

if ( $loop->have_posts() ) :
    while ( $loop->have_posts() ) : $loop->the_post();

        // stuff

    endwhile;
else :

    // Nothing

endif;
wp_reset_postdata();

I’ve already tried some stuff to join them together with no luck, like:

$args = array(
    'post_type' => 'product',
    'post_status' => 'publish',
    'posts_per_page' => 10,
    'meta_query' => array(
        'relation' => 'OR',
        array(
            'meta_key' => '_featured',
            'meta_value' => 'yes'
        ),
        array(
            'meta_key' => 'total_sales',
            'orderby' => 'meta_value_num'
        )
    )
);

Can’t really understand what’s wrong…. Any help greatly appreciated.

https://wordpress.org/plugins/woocommerce/