I have haier Le55b9500u non smart 4k uhd tv ,it is without inbuit wifi , what is the best way to convert in to smart tv ? Any better option then amazon tv fire stick ? Or Amazon tv fire stick is the best one ?
The best option depends on what services you want to access.
Roku offers the largest number of streaming sources without having to configure it.
An android TV box offers the option of using KODI as well as all the android TV apps. A bit more complicated but a lot of them are sold preconfigured. Some of the KODI addons are not strictly legal.
You will find reviews on this site.