I'll probably go with Madge tbh. Vogue, LAP, Papa Don't Preach and Dress You Up are some of my all time fave tracks and Truth Or Dare really made me stan for her on a personal level
Rhythm Nation 1814 is my favorite female album ever so Janet by default. Her debut and Like A Prayer are the only Madonna albums I can sit through without skipping at least a half of the tracks.
They're both MONSTER forces and talents, and they're both two faves (check my profile before you clock my sig), but Madonna's music just speaks to me more and always has.