TLDR; Learn both and choose the right tool for the right job.

Now, for C++ I can share some links I personally follow:

    https://github.com/AnthonyCalandra/modern-cpp-features
    https://www.youtube.com/c/lefticus1/videos
    https://www.fluentcpp.com/
    https://www.cppstories.com/
    https://hackingcpp.com/
    https://www.modernescpp.com/

About Rust, this link https://www.rust-lang.org/learn shares far too many goodies that any level of programmer can benefit out of it.

Enjoy!