Thanks.
According to http://www.dnsredirector.com/compare/
Norton does not block/monitor “Proxy/anonymizer blocking” (which OpenDNS does), but OpenDns does not have “Malware site protection” which Norton does have.
I’m not sure “Proxy/anonymizer blocking” is or if it’s more important than the malware site protection.
(And yes this is in the wrong forum, but I don’t know how to move it.)