One important difference between Java and Go is that Java prides itself in having at least half dozen GC implementations and endless array of tuning parameters.

One important difference between Java and Go is that Java prides itself in having at least half dozen GC implementations and endless array of tuning parameters. So each factor you listed can be tuned at any time and not part of particular released version. Whereas for Go memory usage is more or less same in almost every release. They have singular focus on latency improvement in general or very specific type of workloads with each new release.