Tough call, BTW is bombastic but it's a powerful anthem that didn't pull its punches lyrically, which is what the mainstream needed, imo.
Diamonds is warmer and sweeter, reminds me of some 90s mid tempo tracks with its sparse arrangement and alluring vocals. Lyrically, it's not as anthemic as it is a personal declaration of contentment, which is just as relevant as Gaga's message.