Basically that is a question you should not ask other persons but only your self. Do you face issues with your Hitec? If not then why?????

And the Radiomaster does not have any impression on me, if you read the topic about it there are all kind of issues with software releases and if you are just a simple user and not into the open-TX it will be just another transmitter like many other (I think) more stable options.

It is just what you want or what you need. If you only need to control a car then keep on using the Hitec.