The carpet cat trees provide more comfort to the kitties but they are not made with the same carpet. The general rule is that you get as much as you pay for because the carpet differs in its density. Do not forget the carpet cat furniture has one disadvantage: you will have to work harder while cleaning it. Also, if you teach your kitty to scratch on the carpet cat tree, you are sending her wrong signals that it is not a problem if she scratches over your expensive home carpet. So, it would be better if the carpeted cat tower has at least one sisal post.