I know this is in the Skyrim section and my perspective is primarily from Oblivion. . . . That said, Buffy's always been torn between Mara, Kynareth and Azura.
She was raised in the city of Mara, and love is a very very important part of her life. She often manifests love for her friends the same way a mother grizzly manifests love for her cubs when they are endangered - so she does not consider Mara a pacifist. She also considers the Mother Goddess of Fertility responsible for everything that grows from the ground, from crops to forests.
Speaking of forests, she is ever so comfortable in them and with their creatures of Kynareth and under Kynareth's sky. And the old paladin within her was once a knight of Kyne.
Regarding Azura, Buffy was impressed at her concern for her followers and is indeed a child of dawn; and there is the whole fact that Daedra Lords really are more actively involved in day-to-day life on Nirn. None of the Nine have actually spoken to her - like Azura has.
She does think sometimes how Uriel Septim said he was 'guided by the Nine'. She takes that to mean that perhaps one doesn't have to chose just one.
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