what happens if you get Don Morello to deal with Aiden? any content you miss out on other than the blackmail?
To be honest I don't know. My thinking at the time was that there would be extra content based on Don Morello as payment for stopping Aiden, or that Aiden would somehow get his revenge on Sophia and she ends up in jail or something.
Also you got the problem that the Aiden storyline a lot of people like and they want the blackmail to continue with Sophia ending up in even lewder situations.
I personally wish L&P would just forget about the Sam and Dylan stories and concentrate on the other stuff, Ellie storyline is fine, but I can't really stand Sam and Dylan.