I'll be at AVN this year and will be getting tested, as will my ATF, upon arrival.  Does anyone recommend Cutting Edge or Talent Testing as better than the other for any specific reason?  

You can ask her who she prefers

I've always used Talent Testing.  One thing I like that they do, or used to anyways, I haven't used them for a while.... Is your test results come with a QR Code you can have the other person scan... This way, you know the results you're looking at haven't been tampered with, or altered in any way.

TTS

I believe TTS is the industry standard.  On a provider recommendation, I've used STDCheck.com in the past and had a great experience.  In Chicago, TTS lists 1 testing site, whereas STDcheck has dozens.  Plus, super fast turnaround on results. At the end of the day, TTS would be the smart bet if you're not sure who the provider prefers.

Talent testing is the most common method