I can’t find sources to support those claims. But AFAIK the main difference from practical POV is support time. Oracle OpenJDK builds are provided on rolling release cadence, there’s no LTS concept. Once Java 18 is out, you’re supposed to migrate ASAP. Oracle JDK does have LTS. You have a year after Java 21 LTS to migrate to it. But those 17.0.x patches will not be open source.