Madonna was really the first mainstream personality to bring light onto LGBT topics. I remember watching one of her interviews where she addresses the prevalence of homophobia in the early 1990s. No one dared heralded the cause for gay rights like she did.
I voted Madonna because im not delusional
But to say Gaga hasn't done anything is an understatement.
Out of these options: Madonna > Lady Gaga > Macklemore > atrl