That's a difficult one, because they're so different. I like the metallic shriek of the 360, it sounds so racy.

But sometimes the sound of the 360 could use a bit of a darker growling tune. It can be a bit harsh. So, if you listen to it for a longer period it can be a bit too much.
The Aston has that real V12 sound. Rich, complex and the dark tune. But can't really call it smooth, it sounds agressive and mean too. :x On startup it sounds almost like a mad dog barking. I love it.
I can't really pick a winner. But that says enough I think.