Q:

What is the actual difference of Azure Notification Hubs' Telemetry options?

While researching Azure Notification Hubs, I saw there are two Telemetry options available (source):

"Limited"
"Rich"

Although I have found very limited descriptions on the Pricing and the FAQ pages, this is not enough information to make a decision whether I want the "Rich" telemetry or if the "Limited" Telemetry is enough. Additionaly, those descriptions only talk about the "Rich" option:

Standard namespaces have access to Per Message Telemetry and Push Notification Services Feedback
Rich telemetry: You can use Notification Hubs Per Message Telemetry to track any push requests and Platform Notification System Feedback for debugging.

Also, a Tweet asking @AzureSupport for help only lead to the FAQ page and eventually led them to ask me if I could ask this very question on SO.
The only option available next to asking here is to actually try out, but that would incur a monthly fee and extra effort.

A:

I finally found a useful MSDN page, which has some answers to what telemetry is provided, how, and to who.  It says "This API is only available for Standard tier notification hubs" which means Rich Telemetry only, not Limited.  
If the PNS platform involved supports it, then Success means it was delivered to the device.  Oddly, despite copious other error codes, there seems to be none for "accepted by PNS, but still not/failed to deliver to device."
It provides counts of outcomes, so if you want per-device results, you'll have to send to only to one device at a time.  

