Given a 'products' table (product_id, product_name, category_name) and a transactional 'product_sales' table (product_id, sales_quantity, rating), identify the best-selling product within each category. The 'best-selling' product is defined as having the highest aggregate sales quantity. In the event of a tie in sales volume, the product with the higher average rating should be selected. If a tie still exists after considering both metrics, return all such tied products. The final output must include the category name and product name, sorted alphabetically by category name.