Chinese zodiac vs. BaZi
The zodiac gives you the animal-year lens. BaZi uses year, month, day, and hour, so it can say a lot more about how the chart is put together.
BaZi explainer
What is BaZi, and why is it deeper than zodiac signs?
BaZi, often translated as Four Pillars of Destiny, is a Chinese birth-chart system built from your date and time of birth. The zodiac gives you the animal year. BaZi gives you the rest of the chart.
Why people use it for relationships
Usually to get a better read on pacing, emotional habits, conflict triggers, and long-term fit than the animal sign alone can give you.
Where this fits in ZodiacZen
ZodiacZen starts with the zodiac because it's fast. BaZi is the chart layer for when you want something more specific and are willing to enter birth details.