What is the most ergonomic library to diff data structures in a test suite these days?

I have a huge record of feature flags and some of my tests ensure that these all have the expected value. However using any “naïve” equality assertion in my test suite, I’m finding myself with unreadable dumps on my screen. What is the recommended way today to get a readable diff of the expected and actual values? I don’t mind writing my own tasty wrappers.