I wasn't prepared for Britney and Gaga back to back.
You don't like "Toxic," and "I'm a Slave 4 U" is your favourite Britney song? Safe to say, we have different tastes when it comes to Britney.
Anyway, she's a pop legend, someone who has a voice tailor-made for the sexy pop uptempo numbers that have solidified her status as one of the greatest ever, and "Slumber Party" proved that she's still got that special spark after all these years. I'm slightly disappointed she didn't at least make your Top 20.
Your favourite Gaga song is "Americano"? That's such a left-of-field pick! Many believe that Gaga peaked too early (2008-2009) but when I hear songs like "Born This Way," "Do What U Want," and "Million Reasons," I have to say her greatness never really paused at any point. Her popularity may have wavered, but Gaga brings a wackiness and edge to pop that wasn't in the mainstream before her arrival. If David Bowie and Madonna had a daughter, Gaga would be that daughter...and a case could be made that, at her best, she's better than both her 'parents'.