I suspect toolchain availability was a big thing. Every unix shipped with a C compiler, and if you didn't like it, chances are GCC, which was free, ran on your

I suspect toolchain availability was a big thing. Every unix shipped with a C compiler, and if you didn't like it, chances are GCC, which was free, ran on your system too. AIUI, Ada toolchains have historically been commercial. GNAT was released in 1995, and i don't know how good it was, or is, compared to commercial versions.