so I went googling. Seems there's something of absence of information for the last several years about the technology in the services. The wiki pages for example are way old.
I did find this forum post:
XMFan.com :: #1 Fan Site of Sirius XM Satellite Radio ::
which seems to indicate that circa 2013 chysler had started switching over to xm based "siriusxm" radios from previous sirius based systems. The post says the Ram (and viper) were first- if i recall the 2013 ram was the first to have the version of 8.4 uconnect that we have. So I think it's a safe bet we have XM radios. And that jives with crappy service for north of the border.
Also poking around some more and it looks like sirius radios had 12 digit numerical serial numbers. My previous Chrysler vehicles, including my wife's 2013 minivan, all had that sort of ID. XM radios on the other hand had 8 digit letter/number id's. My 2014 Durango has an 8 digit ID with letters. So Think that about confirms it. We have XM branded as SiriusXM
The forum post above, and other things I've read, as well as common sense, all point to siriusxm at some point shutting down one of their duplicate systems and going all XM (or maybe all sirius). Assuming it's XM and their geosynchronous sats I wonder what they plan to do for Alaska and Canada?