WFL, honestly. It's a brilliant song, I still bop, etc, but it's not exactly that forward-thinking sonically. Toxic was a sort of step for pop music in a particular direction, whereas I don't feel as though WFL represented much of a shift that wasn't already there.
I don't appreciate you making this thread as a response to mine
OT: They're both amazing and deserve every accolade that was given to them. They're a rare breed of trascendental pop songs, which sounds oxymoronic but it's true!