Jenkins Promotions vs Pipelines
I just configured promoted builds plugin and the pipelines plugin and found at least one difference between the two plugins, i.e. the first plugin seems to be able to allow manually deploy of certain stages, while the pipelines plugins seems to deploy everything automatically.

According to this answer, manual deploy of a certain stage seems to be missing.

In summary, it seems that it would be nice to combine the two plugins as it could be handy to have a manual check before deploying to production, i.e. a human has to press the button in order to deploy to production. 

According to this answer it is not possible to combine both plugins at the moment.