That's not true. CDs store discrete data and vinyls continous data. However, it is true that CDs can store formats of higher quality than mp3s that cause no sound degradation.
I think the point I was trying to make was that tape is something different than digital. You can download high fidelity files as well and if you buy a CD you'll probably end up importing the files anyway.
With that said, cassettes are definitely not a hifi option and I'm quite sure it's genre dependent as well.