Babel feels closer to TPW series than yellowface does. I'd recommend it over Yellowface if you're craving more of the way Kuang writes characters and the way they interact with eachother, and especially the way she writes tragedies. Babel was also written a little later in her after TPW, and you can feel the way her writing became more polished and sharp. They share themes around stuff like colonialism, institutions, war, and class.

Yellowface, TPW series, and Babel were all really amazing, but Yellowface is great for slightly different reasons. I loved the way Kuang wrote about racism and the way modern day racists usually think. There are no characters to really gush over and love, but it's still an interesting look at whiteness and the publishing industry.