G1GC divides heap into regions, ZGC uses regions but focuses on minimal pause times.
G1GC divides the heap into equal-sized regions, optimizing for predictable pauses, while ZGC focuses on keeping pause times very short, even with large heaps. For example, in high-memory applications like an e-commerce platform on Black Friday, ZGC might be preferred for its ability to handle large heap sizes with low-latency pauses.
Additional Notes
How do G1GC and ZGC handle large heaps differently?