Visual C++ has the best C++ among commercial C++ compilers.
http://en.cppreference.com/w/cpp/compiler_support
And the table lacks most embedded compilers.
http://en.cppreference.com/w/cpp/compiler_support
And the table lacks most embedded compilers.
But yes, embedded compilers are usually a nightmare.
Yeah, I get that with embedded, it's a crapshoot. However it's probably not ridiculous to say that GCC ports to microcontrollers is not terribly uncommon, either.
GCC and Clang certainly are a lot more useful than for just that tiny range you listed. The reality is they probably cover more platforms than any other individual compiler.