Which is exactly what they'll say about Payton.
They can also say that SP had play calling taken away from him in New York and MM made Aaron Brooks look like a good QB as OC.
Personally I think Coach Payton is better at match-ups and I can't think of anything that sets McCarthy apart, but he's effective.
Both of these guys still have a lot of time ahead of them to write their own legacies apart from their HOF quarterbacks.