I mean, yes, you are biased. 😂 But like you said, very different characters. One older, more aware of his responsibilities, thinks more deeply about ramifications of his words. The other one much more impetuous, less thoughtful because he doesn't shoulder the same responsibities
But I also think that Harry was younger and had a different personality, so he was protected from a lot of what was going on with Diana. I don't know that Paul Burrell is that reliable a source but he says that Diana used to lock herself in the bathroom crying and William used to be on the other side talking her round. She was quite open how much she relied and confided in him. I'm sure Harry was aware of stuff but he didn't have the hands on coping and listening to her paranoia. And William is quite clear about using that word. As was her brother, Charles. So, obviously, being more involved with what happened round that interview, he's going to have very different feelings and expressions to how Harry felt. Because he knew a lot more intimately what had happened than Harry did.