I just want to know whether the ROR sitemap is still an effective choice for SEO? Because, nowadays no one is using ror sitemap.

ROR feeds are pushed as a more detailed Google Sitemaps option because it allows you to put information about products, services, feeds, articles, reviews etc. but mainly people are not even aware about it.

ROR is not for people to understand ,It is used for search Engine to easily undestand content like product ,business info ,images or contact info .