Things like disposables vs cloth, breastfed vs bottle fed, attachment parenting vs non etc are generally things that parents feel very strong about. They need to know that their provider will support their decision either way and still provide quality care.
I understand that you think cloth is better but that is one of those things that is a parent's choice and our opinion on it won't really matter to them. I would keep your personal opinion out of things like that, at least on your website. Just my opinion though, obviously do what feels right to you!