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. Ergoflex vs. Koala Mattress Comparison Sleeping Duck vs. Ecosa Comparison Sleeping Duck vs. Koala Comparison Ecosa vs. Ergoflex Mattress Comparison Ecosa vs. Koala Mattress Comparison