Julia Whelan's narrated work leans heavily into contemporary fiction and romance, which I've noticed across her audiobook catalogue. She seems drawn to stories with emotional depth and complex relationships, often set in the modern world. I've listened to her in everything from Emily Henry's 'People We Meet on Vacation' to Taylor Jenkins Reid's 'The Seven Husbands of Evelyn Hugo,' and the through-line is a focus on character-driven narratives.
That said, she's also the voice for a surprising number of historical fiction titles, like 'The Giver of Stars' by Jojo Moyes. It's less about genre preference for her as a reader, I suspect, and more about projects that offer strong, nuanced female perspectives. She does select and narrate the books she authors herself, which fall squarely into upmarket contemporary fiction, so that's a solid clue.
I wouldn't put her near hard sci-fi or epic fantasy, based on her body of work. The preference seems to be for realism, even when the story has a speculative element, like in 'The Book of Two Ways' by Jodi Picoult.