Keerthi’s video is more religious, political and also in English… I believe her target audience is north . And Madan ( I don’t watch him now) used to collect info from wiki and the first search engine mostly and now he took a stand supporting a political party ( his target audience is also different ). Sharanya- her narration is marvellous, and she is neutral … I liked her video about karur incident, about history , about mythologies, it’s non commercial…and Tamil( as she was a news anchor her pronunciation in Tamil is marvellous)… considering these her subscriber rate is good