[hharney]

I have both XM (primary) and ADS-b. I prefer XM but don't like the cost. I may choose to discontinue and some point in the future but right now I'm still playing the game with Sirius XM.

One item to consider is that XM is available on the ground before you launch. Also with having both side by side XM has some better feature that are not included with ADS-b but seems that ADS-b is catching up and adding more features