It better to take a policy after checking each of the websites. Watch out for the one that offers the least premium, necessarily does not mean good as the "Denial rate" may be high. Many policies offer an add on for critical illness - stroke, certain cancers etc, kidney failure etc. It's also important to pay attention to the inclusion and exclusion criteria, whether the cashless settlement is available, in the rare event can more than 1 major claim be submitted in one year. Last but not the least, consumer complaint websites/forums are a good source to check whether the company you have chosen has many negative feedback or experiences mentioned. If you still need help, most company websites have a live chat box where in you can ask specific questions or have an agent meet you.