I have a stratus reciever (sirius), im using the aux input in my 08 Accord. Do the other receivers have better SQ? Or are they all the same?

I have the stratus in my truck and my wife has a factory radio in her jetta with sirius. I have to say that the Stratus (hooked up to to my antenea input) dosent sound that good. The factory unit sounds better but it still sounds like compressed audio, kinda like a low quality Mp3. I remember when sattelite radio first came out and was advertised as CD quality, yeah right.

I think Very sturdy receiver and mine's taken quite a beating...literally.