I don't see Taylor Swift as a dance act at all though she has dominant choreography elements at times too, especially live.
And I have all her albums (for the avoidance of doubt: no, I do not yet identify as a 14-year-old girl, and you can stick to my previous pronouns he/him). She's a phenomenon and an artist. I actually found out about her first here at the LBO when we discussed Kim K's cerebral and always perceptive ex-hubby's award inanities with Fräulein Swift back in 2009. It was when I bought her first two CDs just to hear what she was like.
Britney was/is a product/object of the powers that be in comparison. More than any other of the dance act girls I can think of. Yes, you can get the girl out of the trailer park, but ...