I wouldn't say that one is better than another. CCS is a very challenging examination, and it covers more than just coding. But....it tends to be the certification preferred by hospital-based coding managers over CIC, because it covers a broader scope of HIM information. Overall, most coding managers feel that they can train coders to abstract an inpatient chart....they simply want to be sure that they have the background knowledge.
The CIC exam is a bit more specific to coding, and does spend more time with PCS. Some hospitals use MS-DRG but others may use APC-DRG, so I would (at least) be familiar with both. Take the AAPC coursework (not just the study guides) if you're leaning towards CIC. People who fail these exams (in my experience) didn't put the time/effort into having full understanding of the material, and how to find the correct answer. This is college level stuff, and coding is not for everyone. Whichever certification you choose, plan to immerse yourself for several months to become extremely familiar with the material. Practice exams are a must....if you are passing them with a 90 or better, then you're ready to sit. Otherwise, keep studying. Since you have your CPC, you have a good idea of how challenging these exams are. I've had coders under my management take both. They say the CIC is tougher.
There's a reason that experienced coders, managers, auditors and consultants make big bucks. This isn't easy work, the risk of making costly mistakes is very high, and hospitals cannot take a chance on poorly educated individuals. If you're committed to learning, this can be a very lucrative career. Good luck.