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					Originally posted by  dinorel
					 
				 
				"Circus"  is  her most  successful "singles" era in the US 
 
Circus era produced two 3M sellers in the US and Femme fatale produced 0 3M seller songs. and even "if u seek amy" which reached inside top 20 sold almost the same of "HIAM" the first single of "Femme fatale". 
 
So "Circus" is her most successfull era "singles wise" in the US followed by Femme fatale. 
 
Femme fatale is her biggest based on airplay though 
			
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 I know all this being the stan. 

 But 
Femme Fatale definitely merits the title more generally with biggest radio hits, more notable singles ("TTWE" will outlive "Womanizer"/"Circus" as the years go), etc. At least that's my personal belief. But in sales, 
Circus wins that by default, yes.