This is another of those questions where the only wrong answer is an absolute statement of what is best-or not. I don't find much difference in my streaming set up and CDs-I think its more dependent on the mastering of the track or album. So, the convenience and variety of streaming works very well for me.
On the other hand, I have friends who say their CDs sound significantly better than any streaming set up they have heard. Who is wrong? Nobody-its a subjective thing and the only way you will know is listen for yourself. I can safely make a definitive statement about what I like-but not what you might like.