Here's my recommendation (I work on OpenJDK at Oracle):<p>If you're using the current JDK version (recommended for regularly maintained applications), it doesn't matter which distribution you choose, as they're all pretty much identical. If you're using an old version (LTS, intended for legacy applications, which might benefit from it), pick a vendor you trust for OpenJDK support, as the builds are <i>not</i> the same, and neither is the support. After Oracle, which contributes about 90% of the work on OpenJDK, the companies distributing builds that contribute to the project and have experience with it are (in rough order of experience and/or contribution): Red Hat, SAP, Azul, Bellsoft, and, more recently, Amazon, and Microsoft.<p>There are, however, a couple of standouts: Alibaba's Dragonwell, which, last I looked, did not meet the Java specification, and Eclipse Adoptium, built by IBM, which is the only distribution built by a team that isn't involved with the OpenJDK project, isn't very familiar with it, and isn't a member of the OpenJDK Vulnerability team, and so get security patches only after the other vendors have delivered their builds.