Well aside from Adele, Gaga came out above the other two.

Gaga > Britney > Beyoncé

Gaga.

Overall, I though Britney's was the best.

Well Gaga lasted the whole year, Britney lasted until late summer, and Bey was all over the place coming in and out. Overall, Gaga.

That's definitely how I think it was.

.

Gaga of course

What Duca said.

Gaga > Brit > Bey.

Gaga, of course.

Early 2011 was a mess

Definitely not Bey. Though she'll sort that out in 2013.

Gaga >>> Beyonce >>>>>>>> Britney

She had 2 #1's, four top 10 hits, and a successful tour, so that makes up for the underwhelming sales. The album became her 6th to debut at #1, it's in the Guinness Book of World Records, and it was still one of the year's bestsellers.

Gaga actually lasted a while and stayed relevant all year. So Gaga.