Best 30 Pin to Lightnening Adaptor

What is the best audiophile grade 30 pin to Lightening adaptor available? I want to get a Pure i-20 dock and want the best cable to connect my iPhone 5 to it.
Your best bet and safest option is a genuine Apple one.

Inside these adapters Apple have put chips inside to extract the digital signal, having another brand may cause slight issues.

Example OTG cable is just wiring, so technically any type of OTG will be fine but with Apple there is a chip to help the extraction.

Hope this helps.