Akwai bambance-bambance da yawa tsakanin roba da roba na zahiri. Babban fa'ida shine ɗan roba butyl yana da mafi kyawun kwanciyar hankali da juriya na tsufa fiye da roba na zahiri. Yana da elasticity na roba na halitta kuma bai shigar da kayan adon adon ba, amma ba butyl ba. Aminci na rigakafi da juriya na tsufa
