All of our servers and daemons at Cronitor have been built using Python. I know you're asking just about these two languages but i would consider a language with a bigger library and user base. It takes discipline with language features but we've had a lot of success writing stateless daemons that are under heavy load 24/7. It's been far easier to think from a fan-out pov vs worrying about every clock cycle wasted by, for example, the garbage collector.
