Asking this question is like asking about which oil to use but here goes:
I've been using the KAOKO for 3 years now, including 2 X country trips, without a hitch. It assembles at the end of the throttle and uses friction to work. Installation is fairly easy, I have a video on Youtube showing the extraction of the center hub you'll need to do:
https://www.youtube.com/watch?v=YbP95M6MSNY
There are simpler choices and more expensive ones, I've had a couple different ones prior to this but this one worked perfect for me.
https://www.revzilla.com/motorcycle/...FYONswodn2YKgA
Good Luck