CISM or CISSP first

[mamo <mamo74 () gmail com>]

Hello.

I work as IT Infrastracture and Security cosultant from 10 years for
large organization.

I would like to take a certification in IT Security. I am a technology
guy working on large integration project on security aspect , but
often involved in auditing, policy management and process part of
security (the part often missing, more than the tech stuff). I match
the experience requisite of both cism & cissp. I am already CISA &
ISO27001 certified.

What have been your esperience with cissp or cism certification?
Which one is more value (on the market and as  a way of studing
interesting new stuff)? What topic are better covered by the two
certification? Which one is easier to study and pass?

Can you share with me your thought?

Best Regards,
Mamo