PMP vs CISSP

Hi,

I am confused which certification i should be focusing on;
PMP (Project Management Professional) or CISSP (Certified Information Systems Security Professional)?

I am currently working for PricewaterhouseCoopers (PwC) as an Assistant Manager in Systems and Process Assurance.

My current qualifications are:

1. CGEIT (Certified in the Governance of Enterprise IT)-2009
2. CISA (Certified Information Systems Auditor)-2006
3. Masters of Sciences (In Computer Sciences)-2005
4. Bachelors of Science (In Computer Sciences)-2004

I have been working in the field of IT since the last 5 to 6 years.

Thanks.