> but of course, which must also work on tiny hardware with a weird custom OSes on some hobbyist hardware, and with 30-year-old machines in some large organization's server farm - then you would choose the C++ projectt, since you will be able to make that happen, with some pain.

With the old and proprietary toolchains involved, I would bet dollars to doughnuts that there's a 50% odds of C++11 being the latest supported standard. In that context, modern C++ is the trendy language.