BSM and syslog... why should I consider the first?

Hello everyone,

I'm working on a Security program for a large infrastructure.
I have to deal with Sun Solaris, and I was wondering why I should
consider logging via BSM and not syslog.
System admins have a good knowledge of syslog, and I can standardize
logging in different UNIX OSes easily if I use it.
Is there some breaking feature which could make me prefer BSM?
Is there a reason to use syslog and BSM?

Thanks in advance,
G0k