Don't forget if you're using a headless rig, that its THAT PC that need a ping, not the one managing it. But if under the same LAN, there should be no significant difference.
Having said that, node trackers do not register the real ping through the website (at least for me). But excellent to pre-select the best pools.
Always check double yourself, a couple times at different times, you'll be pleasantly surprised
Look for one that is under 50ms if possible
Windows - start - cmd
OSx - Terminal
Type, for example drk.altmine.net:7903
without the port number, or it will not resolve host. Let it run for 10-20 seconds to have an idea of the connection health.