To my knowledge, the fidelity of the sounds you can get with Csound far exceed Supercollider. Also, Supercollider has a very restrictive license, preventing its use in basically anything besides small side and school projects, whereas Csound has a very permissive license. I have been doing a fair amount of research along these lines, and although Csound is definitely interesting in the sense of its syntax, it is, as far as I can tell, the most powerful programmatic sound system.
To my knowledge, the fidelity of the sounds you can get with Csound far exceed Supercollider. Also, Supercollider has a very restrictive license, preventing its use in basically anything besides small side and school projects, whereas Csound has a very permissive license. I have been doing a fair amount of research along these lines, and although Csound is definitely interesting in the sense of its syntax, it is, as far as I can tell, the most powerful programmatic sound system.
Csound has introduced more real-time features, and you no longer have to rely on a score to make sound. For example: https://www.youtube.com/watch?v=eacyGKRBpwA