title: Best server to sync two machines
body: <p>I have a machine in Sydney and a machine in London, both AWS instances fwiw. </p>
  
  <p>I wish to time sync them.  I'm having trouble deciding whether its best to have one serve the other, or have them both be served by a server (say, the default ubuntu ntp server pool).  Or, since they're both AWS EC2 instances, does this mean in this situation an amazon server is actually the best option?</p>