Q: Why is Beastars superior to Zootopia
A: It tells a Zootopia-like story but without convoluted race shit.
Race discussion is still there - it's just that there's a little more effort put into making it seem believable rather than simply transplanting the real-world equivalent directly without taking a second to realize that sentient animal people would be far more different to each other than humans are. However it is less about race and more about differences between clearly different groups. Predators ad prey aren't a dysfunctional shoe in for blacks and whites, but represent just that predators and prey.
A good video that I recommend, about this "animal-race allegory"
issue is 'Zootopia, Umasou, and the Failures of Race Allegory' by Jack Saint: https://www.youtube.com/watch?v=7oR6iET6FVo