Once you buy an HD receiver then you will get HD radio for free
but your stations have to have the feature to get the quality.
You pay for Satellite Radio but you get a ton more stations and
can pick and choose to listen to any within your package. HD is
only for regular local radio stations that have an HD antenna.
Both boast great sound quality which is true� they are way
better that a normal radio station but still short of CD quality.
If better sound if what you want then buy an HD receiver� if better
sound and more options is what you want then buy a subscription to
satellite radio.