The Cicerone program gets expensive after the initial, easy certifications. I'm not sure, though, how much influence that program has in the industry unless you plan to be a server.
BJCP is less expensive and their web site has a ton of good info about testing as well as beer styles. Certified judges don't get a whole lot of respect in the pro beer industry until they reach a higher rank, like National or Master.
As a higher ranked judge, I get a few perks, mostly the opportunity to be on the best of show panel at the end of competitions.
I think it depends on what you hope to do with the certification. If you plan to be a pro brewer, neither would help a whole lot. If you were planning on marketing for a pro brewery, either would probably help your career path. If you just like judging beer, I'd suggest BJCP.