R&B is pretty fabulous (happy to skip the junior shit).
If he's good.
But if he looks young and mistake prone the Jr. captures that.
But R&B is kind of a cool knickname, and it's one of my dated references* that still has relevance today ...
* I'm thinking Wynonie Harris doing Good Morning Judge or Louis Jordan laying down Jack You're Dead post-WWII.
otherwise I grew up learning that R&B stood for Ruth Brown . . . well, that was her catchphrase when she had a radio show on NPR in the 80's