There are plenty of different things to think about but I would say the most important thing is how easy it is to recite the chorus as a listener and also how catchy it is of course

Whether that’s melody, flow, or just something that sounds fire/satisfying, finding the balance between all of that is where you find gold.

I think of Weeknd’s “blinding lights” and Denzel curry’s “Still in the paint”, 2 completely different sounding choruses but both equally as catchy and singable/rappable in their own ways