My cousin used to lay/install carpet. He always said get the best padding you can afford. It's the friction between the layers that seem to wear out the carpet when it's a combination. I have pets and will not have carpet. I have seen results of carpet replaced after 5 years being well cared for and it's still gross when removed. I have too many allergens for carpet. I can do throw rugs but only have 3 of those. One in the bathroom and 2 in our bedroom.