I'm preparing to decommission an old Ubuntu 10.04 system that's running Nagios. Plan was to set up a new VPS just for Nagios, with a more recent distro release, but... does it make sense to stick with Nagios? This would be a good opportunity to switch, if there's reason to switch. How does Zabbix or anything else stack up against Nagios?

I'm currently using Nagios, with NRPE on my servers as well as Munin on most servers too.