Should I start using headless WordPress for client projects?

I mostly use WordPress for client projects and they are very happy with the solution.

Recently I visited many big projects using React and Angular and the performance is super fast. (i.e.: mobile.twitter.com)

I would like to know that should I also start providing solutions using headless WordPress or other CMS? And if yes what is the best way to do so.

Also, I would like to know the best among Angular, React and Vue, considering long time solution.

Thanks in advance :)