From a monetary point of view, if you want to opt for Ceramic Coating, then you can directly go for it instead of going for Teflon. If you have already gone ahead with TC and the CC was an afterthought, then you can wait for a few months, till the TC lasts, and then go for CC for optimal results. However, if you have some specific requirements, then it is better to discuss with a trusted mechanic or a professional coating provider.