Haven’t done much reading on Anne Brandon, but you’re right about the scandal:

Far as I know, Randal Haworth wasn’t her former ward she was guardian of and wasn’t fourteen years old at the time so…I would say I still like her more than Charles Brandon.
Tbh, Charles Brandon is one of those figures that like…the more I learned about him the less I liked him. And Tudors does so much to make him more palatable to viewers– they aged him down, to the point where it looked like Mary Tudor (his third wife) was older than he was (the opposite was definitely true). And while they wrote that he wasn’t faithful to her (idk if that was true, actually), they made it seem like there was a decent length of time between his third and fourth marriage. IRL, he married Willoughby less than three months after Mary’s death.
They also put in a line about Katherine Willoughby being seventeen when he married her (which confused me, at first– why not eighteen– until I remembered that the age of consent in the UK is lower)– in actuality, she was just fourteen, and Brandon was forty-nine years old.