If you record something with analogue, the sound will be much warmer, and will have a core to it that digitally recorded music doesn't have. And that is even if you take it from analogue and make it digital-it still has a better sound. I never use mp3s, because I don't have a cd burner, and the kind of music I listen to (classical) is hard to find over the internet.
And while CD's may technically have better sound quality than tapes, I have found that at least for classical music, tapes sound much better. I am pretty sure that is beacuse tapes don't have sample rates-they play continuously, while CDs do have a sample rate-where a sound is played, then silence, then more of the sound, etc. And while you can't hear these individual silences, the overall effect is not very good.