Mattress Comparisons Wondering how popular mattresses stack up head to head? Check out our detailed mattress comparisons of some of the biggest Australian mattress brands such as Ecosa, Koala, Sleeping Duck, Noa and Ergoflex. Sleeping Duck vs Ecosa Comparison Ecosa vs Koala Mattress Comparison Ecosa vs Ergoflex Mattress Comparison Ergoflex vs. Koala Mattress Comparison Sleeping Duck vs Koala Comparison