If you are certain that you can outperform variance and expected return, then that's an argument for buying from Westhash.

As to speed and locale, if I ping each from the US west coast, the results are:

PING westhash.com (141.101.127.76): 56 data bytes
64 bytes from 141.101.127.76: icmp_seq=0 ttl=56 time=13.977 ms
64 bytes from 141.101.127.76: icmp_seq=1 ttl=56 time=16.071 ms
64 bytes from 141.101.127.76: icmp_seq=2 ttl=56 time=16.676 ms
64 bytes from 141.101.127.76: icmp_seq=3 ttl=56 time=14.928 ms
64 bytes from 141.101.127.76: icmp_seq=4 ttl=56 time=15.658 ms
64 bytes from 141.101.127.76: icmp_seq=5 ttl=56 time=13.533 ms
^C

PING f2pool.com (112.124.23.109): 56 data bytes
64 bytes from 112.124.23.109: icmp_seq=0 ttl=49 time=291.457 ms
64 bytes from 112.124.23.109: icmp_seq=1 ttl=49 time=295.321 ms
64 bytes from 112.124.23.109: icmp_seq=2 ttl=49 time=520.498 ms
64 bytes from 112.124.23.109: icmp_seq=3 ttl=49 time=439.079 ms
64 bytes from 112.124.23.109: icmp_seq=4 ttl=49 time=360.980 ms
64 bytes from 112.124.23.109: icmp_seq=5 ttl=49 time=299.082 ms
^C