Nuance and vibrato are very personal. Listening to many artists, whether vocal or instrumental, proves that right away. Now, if someone comes from a school of vibrato, you will most likely be able to hear that in those who are staunch supporters of that particular school.
In this video, I demonstrate a few different kinds of vibrato. Since the name of the video is "Nuance & Vibrato," I am trying to highlight vibrato as a kind of nuance. More to come on this topic!