I would say that the JVM has longer history of open source and a much larger ecosystem of libraries. If you're building a language on top of JVM you can take ad

I would say that the JVM has longer history of open source and a much larger ecosystem of libraries. If you're building a language on top of JVM you can take advantage of that. Also pretty sure JVM has better performance because of better JIT and GC. The CLR had a second mover advantage to fix a lot of platform level things like utf8 strings, generics, tail calls, etc.