In the grand scheme of things, it does not matter where you stand on the issue of analog versus digital recording. It is clear that they both have their merits as well as their respective problems and uses. They can both be widely popular in certain cases, which makes your opinion on either one entirely relative.
1. Digital Vs. Analog Recording
Regardless of digital vs. analog recording, the sound is still recorded the same way. Air is pressurized and recorded by a microphone which is then transformed into a pure magnetic and electronic signal.
An analog recording, from there on, is formulated by taking these same signals and physically imprinting them onto something that can then be played back later. These include the cassette tapes and vinyl records of old, which, by the way, is making an enormous comeback in popularity thanks to the new-age ‘hipster’ movement.
On the other end of the spectrum, a new electronic recording takes that same analog signal that has been recorded and directly converts it to a digital ‘representation’ of the same sound, via electricity and magnetics. It is then converted into binary code, in the form of numbers, for computers to interpret and then playback.
After an analog signal has been digitized (and therefore converted), it can be copied and dubbed many times. It can then be put online or copied onto a CD or hard drive. This is why digital audio and music tracks are so plentiful and cheap when compared to its physical counterpart.
2. Audio Bandwith And Quality
The ‘bandwidth’ of a signal is essentially the amount of, and therefore the frequency of, the signals that have been recorded. Because analog is ‘physical’ (technically) any sound, no matter how bass-heavy or shrill, can be played back exactly as it was heard and therefore originally recorded. This high fidelity is because of how analog records; in the olden days, having a needle cut into a wax candle to record sound was the easiest way to record it. Therefore, anything recorded could easily be played back in the same way because it was physical.
Digital recordings, due to their respective recording process, work in an entirely different way. Because you are electronically and digitally recording a signal, by converting the same analog signal to digital numbers, you lose some of the quality that was originally physically recorded.
This is why you can hear leather boots squeak or a pin dropping in the background of a vinyl record, but on some low-quality digital records, you can only hear the loudest or at least the ‘most prominent’ quiet sounds being able to be played back.
You tend to lose a lot of the quality that originally was there when you convert analog to digital. With all of this having been said, you can see audio ‘purists’ like to stick to vinyl and cassette-based music and sound rather than digital.