This paper utilizes parametric modeling techniques to perform side-by-side comparisons of software development using Borland® KylixTM 3 versus Linux® g++, the name sometimes used for the GNU C Compiler (GCC) when it is being used to compile C++ programs. We examine typical embedded projects,server-side Internet projects, and client-server applications, then look at the relative efficiency of the two development environments in terms of effort, cost, schedule, quality, and lifecyclecosts. In all dimensions of this comparison, it is established that Kylix 3 outperforms g++, often with an improvement of two-fold or more.