1. BOMT
2. Oops
3. Toxic

That's in terms of impact, not actual sales.
I know Womanizer charted better and sold more than Toxic and Oops (?), but it's hard to compare her newer singles to older ones, because most of her old singles weren't even released physically.

And LOL @ all the exhale meltdowns. That place is so unbearable lately. I mean it always has been, but lately especially.

Right?

Meltdowns over Demi performing and Britney not. I can't.

Stronger peaks as well, since it went #1 in about twice as many countries as “Toxic.” "Womanizer" takes the cake, even though they're close.

Toxic >>>>>>>>>>>>>>>>> Womanizer

WW:
#1 ...Baby One More Time
#2 Oops!...I Did It Again
#3 Womanizer
#4 Toxic

US:
#1 ...Baby One More Time
#2 Womanizer
#3 3
#4 Till The World Ends

UK:
#1 ...Baby One More Time
#2 Oops!...I Did It Again
#3 Sometimes
#4 Womanizer

Her biggest hits are

Baby one more time
Womanizer
Toxic


Oops is the 4th one to me ... Its sales kind of turn me off

Well, it was 2000. You can't compare sales of physical singles to sales of digital singles. "...Baby One More Time" was a monster worldwide seller, but it was an exception. It was the biggest-selling single of the teen-pop era by a landslide.

LMAO, are you serious?

As most have been saying, it's BOMT, OIDIA and then Womanizer. Toxic was big in terms of impact, but mostly because it gave Britney another #1 hit in the US after so many years and the radio ban, while Womanizer had much better peaks and the same or even more longevity.

Well "Toxic" wasn't released during the peak of digital sales either and sold really good , and the nice thing is that it kept selling consistent over the years.

Digitally there are some old singles of spears that have sold more than "Oops".

In terms of airplay Spears has better airplay hits than "Oops" in both US and WW.

In UK in terms of sales its her 2nd ... But in terms of airplay "Toxic" kicked its ass.



I don't know for me "Oops" is not her 2nd biggest single OVERALL at all.

I agree about everything except that there's no way in hell TTWE was bigger than Toxic in the US - As you said yourself, we can't compare sales from early 2000 to now.

Her label limited the release of Oops. It was better to sell albums than singles there. Britney could've easily had a bunch of #1's like her peer, but look at her albums sales in comparison.

TTWE was bigger in US. Deal with it

TTWE was bigger than Toxic in the US. Where's the airplay receipts?

It had to do with the time. Toxic was the biggest pop single of 2004 and female single, but only because 2004 was extremely urban.

You people aren't seeing the bigger picture, but whatever - Stick to your opinion, I'll stick to mine. I was running a Britney website back in 2004 so I know very well what I'm talking about.

"Toxic" was the biggest single by a female artist of 2004.

And iit kept selling over the years.

Digitally it has sold 1,7M units in US being her highest digital selling "old" single.

In physical sales it was also one of her biggest sellers


I repeat "Toxic" is one of her 3 biggest singles of her career.

nnnn Toxic was and is bigger than TTWE.

I took that from the chart Billboard compiled (Britney's 20 biggest Hot 100 hits.)

#1 ...Baby One More Time
#2 Womanizer
#3 3
#4 Till The World Ends
#5 Circus
#6 Hold It Against Me
#7 I Wanna Go
#8 Toxic
#9 Oops!... I Did It Again
#10 Gimme More
#11 (You Drive Me) Crazy
#12 Everytime
#13 If U Seek Amy
#14 Piece Of Me
#15 Sometimes
#16 Stronger
#17 From The Bottom Of My Broken Heart
#18 Lucky
#19 Break The Ice
#20 I'm A Slave 4 U

Ranked using a point system based on peaks, airplay, sales, longevity, etc.