Selecting the Best Download Server in Synaptic Package Manager

[busprof]

hmc.edu is Harvey Mudd College in Claremont, California.   Their focus is math, science and engineering.  A number of universities host Linux distros, and they are generally very safe.  Speed-wise, they will be faster in the summer, when fewer classes are ongoing, therefore not as much demand on their servers and bandwidth.

[dayooper]

In the Help Manual under "Software Updates" subheading "Your Software Updates Country Location", it recommends to pick a download server with the word "ubuntu" in the name. I did so. However, when I hit the button "select best server", it gives me "mirror.hmc.edu". Which one is the best (safest and fastest) download server?