This debate does not focus on "which technology is better" or "which has better support", rather it focuses on which of these two technologies seems more acceptable in terms of privacy policy and user information management (on his respective toolchain, compiler, etc).
I think C and C++ are safer options, because GNU doesn't use this technology in particular. But Dart are obviously using opt-out telemetry. You should disable it manually. Idk the case of Ruby, sorry :(
This is the sad true. Nowdays, sdk haves tons of these analytics and telemetry.
According to Dart documentation we can disable its analytics. And the first time the CLI is executed, this analysis is not used (respecting the opt-out concept). Is at your discretion trust Google's words (or investigate Dart's source code to find out if it is true or not, or if there are even other unethical means, although I find it a bit unlikely). If you wanna do the second, You can use something like CatFish to help you.