This is where we differ.......I have XM in one truck and Sirius in the other--and I use it all the time. Granted, I don't use Pandora on my phone and maybe if I did I would give up XM. Do you have unlimited data on your phone?
I used to have unlimited data, but switched for unlimited shared minutes/text with 1 gig data shared between myself and my gf. I thought for sure that we used way more than a gig from the amount of music we streamed, but when Verizon did analysis we never reached 3/4 of a gig in a one month period. Rep said its $10 to add another gig so check status towards end of cycle to be sure its within limit and if close then add a gig onto service to avoid going over.
So depending on who your carrier is, check to see how much you use. The only reason I keep XM is for O&A, all the music is just like FM to me. Pandora and iheart radio are great and thats what I use in my car. Would use in bike more often if I get around to working in bluetooth for phone to stereo. Just don't like fiddling with patch cable to phone on short trips.