[syslog-ng] pipe or unix-stream to feed another program ?

Hello, I am doing a new syslog-ng log server setup and I want to find the more robust way (minize lost messages) to feed a perl script with log messages "in real-time". In case the perl script die during the process of the messages there while be a process to restart it, But what mechanism between the "pipe" or the "unix-stream" while give me more control on the number of messages that can be buffer during the restart of my perl script ? Thanks