Opinions on how to listen to music:
Vinyl - If you like music, this is probably the way to go! And I don't just mean listening to music, but you care about how it's packaged and the distinctive sound you get from a record. The covers and artwork, while maybe not as sturdy as a jewel case, are much more interesting, especially a lot of albums from the 60s and 70s. Personally, I think blues and classic rock sound the best in this format. If I had a working record player, I would build upon the small record collection I have and the collection my mom has had since she was a teenager.
CDs - Good for people who want physical copies that can be listened in a car, stereo, or on a computer. The sound quality is pretty good and is probably the most versatile medium available for music, as they can also be converted to mp3s and backed up on a computer or mp3 player. The artwork is not as interesting and jewel cases suck, as they crack easily, but they protect your music well enough. Also good for making mixes for other people, as just about everyone has a CD player.
Cassettes - Good for playing in a car if your car only has a tape player (like mine), but otherwise not worth the money, as they just don't hold up as long as the previous two, which affects the already medium quality of sound. Also good for making actual mixtapes, which I have done using my stereo.
8-tracks - Why do these exist? I'm not really sure. They're like beta tapes. The reason for their existence is debatable except as a transitory medium from vinyl to cassette.
Phonograph - Good for historical purposes. If you have one of these, you are either weird or awesome.
Live - Good for concerts, but not portable in the slightest. If you have a live band that follows you around and plays what you want to hear, can I be your friend?
And I forgot...
MP3s - They don't really exist physically and you have to back them up in a million places, so really, what's they point of buying mp3s? Go buy a CD and convert it instead of just buying sound.