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you have to do a test<br />
tool #1 <a href="https://www.grc.com/dns/benchmark.htm" rel="ugc">https://www.grc.com/dns/benchmark.htm</a><br />
tool #2 <a href="https://code.google.com/p/namebench/" rel="ugc nofollow">https://code.google.com/p/namebench/</a>
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Sorry forgot to answer your second part of your question. I suggest doing some tests with the dig tool where you can specify exact DNS server and query wanted and you get also exact response time measurements.<br />
<br />

<pre><code class="code-1 nolinks" id="code-20-41381809-1"><span>dig @8.8.8.8 www.google.com A</span>
<span>dig @208.67.222.222 www.google.com A</span>
</code></pre>
give results from google public dns and opendns for example and if you have properly installed dig (i.e. with hint servers) you can leave out the @8.8.8.8 part and it'll go through the hint servers.
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Need to point my DCs to outside DNS for all forwarding queries as opposed to using root hints. Suggested practice is using your ISPs DNS, however I would like to know a comprehensive way to measure query response performance.
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Need to point my DCs to outside DNS for all forwarding queries as opposed to using root hints. Suggested practice is using your ISPs DNS, however I would like to know a comprehensive way to measure query response performance.

Picking the best outside DNS Server for forwarding role.

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

The Domain Name System (DNS) is a hierarchical, globally distributed system responsible for associating the name of a computer, service or other resource into an IP address for connecting to the Internet or a private network. Most prominently, it translates domain names to the numerical IP addresses needed for the purpose of computer services and devices worldwide.