Memory usage is smaller mostly for small apps. Larger apps will see larger memory usage because the GC and heap layout is a lot weaker.

SVM/native-image has its place, but currently it's optimised for things like command line apps or servers that people constantly shut down and start up to try and save on huge AWS costs. Actual runtime throughput and latency will be far better on regular OpenJDKs, especially the latest ones with much better garbage collectors.