Different set of bugs (I know of more annoying bugs in clang and libc++ than I do of their GNU counterparts, perhaps only because I know gcc better), different performance in the generated code. Try them both and benchmark, see which you like best. I believe you can get gcc from homebrew, but beware of linking gcc-built code with libstdc++ and not libc++.<p><a href="http:&#x2F;&#x2F;stackoverflow.com&#x2F;questions&#x2F;18976922&#x2F;how-to-use-the-gcc-compiler-in-the-mac-terminal-instead-of-clang" rel="nofollow">http:&#x2F;&#x2F;stackoverflow.com&#x2F;questions&#x2F;18976922&#x2F;how-to-use-the-g...</a>