Since 2000?
New X-Men
Uncanny X-Men
Astonishing X-Men
Wolverine
New Avengers
Mighty Avengers
Dark Avengers
Ultimates
Ultimates 2
Ultimates 3
Ultimate Spider-Man (sold better than ASM for a while)
Ultimate Fantastic Four
Ultimate X-Men
And there were periods where the JMS era Thor, Loeb Red Hulk ver of Hulk, Brubaker's Captain America, and numerous other titles outsold ASM.
Amazing Spider-Man is not a guaranteed top seller for Marvel regardless of what creative teams are working on it, no matter how much some people would like that to be true.