Of course it is Circus. Especially considering the lows that Britney managed to rise from. And in such a short period of time.
It just completely proved that no matter how much of a tabloid fixture she became, the general public never forgot that she is first and foremost a popstar. This is something that many entertainers struggle to regain after bad press. Even after the biggest celebrity meltdown in recent memory, the public were still willing to welcome Britney the popstar back with open arms.
but whatever Mariah takes it all no matter what..