12-03-2012
From my experience, unless you are running an NTP server to synchronize your own devices against that reference (your NTP server) then, you are better off running ntpdate in a crontab to keep your time in sync.
On the other hand, if you are managing a large organization, then you should run one or more NTP servers in your organization and they all the devices and hosts within your organization should sync to your internal servers as a matter of policy.
There are many reasons for this. First of all, your internal devices will be closes in time-sync if the network-distance to their NTP servers are relatively the same. Second, it is better "net etiquette" to have a handful of devices (ntpd processes) sync with external time services versus every device in the organization.
Also, when external NTP servers change, it is only necessary to update the main time servers in a organization. There are more reasons, but you get the idea.
On the other hand, if you are not a member of a large (or even medium or smallish) organization and are just syncing your computer; then ntpdate is all you should ever need. Just run it in your cron files.
The most important thing, of course, is to insure you system clocks on all devices are in time sync, so your log files and process times are also in sync.
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