it’s like you’re comparing notepad with wordpress.
i like “Contact Form 7” for my simplest contact form requirements simply because it doesn’t come with all the bells and whistles cforms does, and best of all it is idiot proof – so to speak.
however, for projects that require more secure forms and better form management (including post processing & tracking), I rely on cforms.
there is simply nothing that compares in that department to it.