rtionline.gov.in is the only authorized website. It is the only Government website where you can file directly RTI while paying online fees. Others like onlinerti.com and onlinertiapplication.com are all private RTI consultants. These type of companies actually employs Junior or mid level Advocates to do the work on their behalf.
Please approach some Advocate in his/her chamber to a better RTI consultation or draft your RTI self. I will not refer you in those factories!