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For the most part, the various JDKs not really different. They're builds of the same OpenJDK repo.

They occasionally have a few small changes, maybe with a few extra bugfixes new or a backported.

The one small difference between compiling it yourself is that Oracle does control the TCK, a test suite for the binaries that Azul and others might use but not open to you.

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I've got a task at work to install Oracle WebLogic and migrate a legacy app from an older OAS instance. The Weblogic installer didn't even run on OpenJDK, it specifically checked for it and crashed with a "OpenJDK builds are not supported" error. No idea why that is since I read everywhere that they're essentially the same thing.

I believe that when you license Weblogic from Oracle, the Weblogic license includes a license for the Oracle JVM it runs on. So there is no reason to run Weblogic on another JDK/JVM. I assume that Oracle requires their JDK/JVM for Weblogic to keep support simpler.

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