I have my CEH but do not have a CISSP so cannot fully talk to its requirements. My impression though is that CISSP is likely more broadly recognized and better defined. It has 10 knowledge domains. The CEH is not as well defined and to me seemed more directed at penetration testing and understanding hacker mentality. CISSP seems to be more toward management strategies and CEH is more dedicated to “worker bees” that manage desktop and network security at the detailed work level.