Pretty straightforward (-h tests a single A record, -z, the default, tests random labels under a zone).
OpenDNS was faster than Google for me, but slower than my own ISP. However, the numbers are under the noise floor; Google DNS is plenty fast, and bound to be more reliable than your ISP. It also doesn't break the DNS like OpenDNS does.
My point isn't that I know which is faster, but that it's really easy to just test for yourself.
Short summary:
Pretty straightforward (-h tests a single A record, -z, the default, tests random labels under a zone).OpenDNS was faster than Google for me, but slower than my own ISP. However, the numbers are under the noise floor; Google DNS is plenty fast, and bound to be more reliable than your ISP. It also doesn't break the DNS like OpenDNS does.
My point isn't that I know which is faster, but that it's really easy to just test for yourself.