Who is more famous Taylor swift or brittaney spears?

Answer 1

Britney Spears has been around longer but, personally, i think Taylor Swift is a better singer and has better songs :)

Technically though:

Britney Spears has sold over 83 million copies of her albums and has four of her albums among the top 20 biggest-opening-week albums of the decade ( according to Billboard )

Taylor Swift has been listed as the top-selling digital artist in music history with over 24.3 million digital tracks sold to date. Her Fearless and Taylor Swift albums reached sales of 2.1 and 1.5 million in 2008 and Fearless has topped the Billboard200 in 11 non-consecutive weeks; no album has spent more time at No. 1 since 2000.

So I'll let you decide which is better