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My advice, find a few people who have both and spend some time listening to each.
XM still has the same number of commerical free stations, and more than Sirius. Yes they have added some more stations and some have commericals, but to be honest a few are good, they play six to eight songs and have two minutes of commercials. But if you want commercial free, they are still number one.
So, unless you are into Stern and need Sirius, or Opra and need XM, then the station programming and songs are personal.
And you can get XM for $77.00 a year by giving them the code GMWINBACK. It worked for me.

Besides, I certainly am not intelligent enough to read your mind and know what songs you like, so my recommendation is do some more research, but don't go with what others say is better. I did, and I cancelled Sirius after three months, a few years ago and went with XM; but XM may not be right for you.