it sounds better.

with a good sound system the dynamics and tone  have more range, from a digital signal (especially on something cheap like a CD) ...it's not all there like it is on vinyl

that's basically it.

it's not saying digital is bad...but you get what you pay for...a CD maybe costs 3 cents to make if that...and the dynamic range on it is limited....it's convenient...MP3's the quality is even worse....that's why people go for FLAC files and there's even something that has more range now..can't think of the name of it off the top of my head.

but unless you have a high output computer and top notch speakers...playing a FLAC through a built in a 1 inch speaker is basically pointless anyway