[syslog-ng]which os for a central logserver?

Hi, I was just wondering in these days of the big'n'mighty systems if there's a preference for the OS (more exactly Gentoo Linux or FreeBSD) of a central logserver using syslog-ng. Are there any OS-specific problems or specialities that I should be aware of if I'm using this or that OS? Or are there any syslog-ng specific things depending on the host OS? If anybody has some experience using those OSes as central logservers, would he say some words about the positive-negative sides (in private, maybe not everybody's interested in this chit-chat). The machine would receive logs from nearly 20 servers (mostly Linux and 3 Windows machines), and has the job to analyze the stuff periodically. Thanks in advance, Tamas