Here's a guy just eating a ton of Gros Michel bananas. I guess if Cavendish was sweeter and "more intense" in flavor it might taste more like artificial banana flavoring. I guess the basic gist of it is that banana flavoring is one flavor in actual bananas and the Gros Michel has more of that flavor...but has other flavors as well. So, the Gros Michel will taste more like banana candy than a Cavendish but banana candy only has one flavor that is part of what you taste when you eat a Cavendish or a Gros Michel.
https://www.youtube.com/watch?v=jUtQfJISrFk