This question was asked by a friend one mine. iWebs.ws free hosting service is one with way too many negative reviews because of their shady business tactics. Users sites get popups in every page and then some times just redirect to other sites. But They are not same company I'm 99%. iWebs.com looks like a professional hosting company. I checked the domain whoIs which is legit and open. no hidden stuff.
iWebs.ws probably is a reseller of YouHosting. Nothing wrong with that company but there way too many inexperience resellers try to run free hosting and paid hosting companies using YouHosting. And their servers are little too overloaded always.
Having similar names can be bad sometimes like in this case. People have no idea but they just make connections since names look alike. Also abusing users is something work bad for free hosting too because people think twice even before using really good free hosting providers.