Depends on playstyle, character in question, and console......
As a 200+ hour widow on ps4. High sense is recommended due to the nature of how you need to shoot with her. Also low auto aim window. The Auto-aim drag is really bad on console, but auto aim is still necessary. So minimizing its window of strength helps to eliminate drag.
As for hanzo. Tbh as you go deeper into both characters you will start to notice just how different they are. So though im not a huge hanzo player, my though is low sense on him.