There has been a strong shift from analogue tape recordings, to digital ones used commonly by cameras today. Whilst it may seem like a logical and purely advantageous move to do so, there are certain attributes that analogue recordings still retain.
Analogue tape recordings tend to pick up certain fidelities and lighting that clean cut digital recordings smooth out. This can be an advantage or a disadvantage depending on what you are using the recordings for. It may be useful to see lighting arrangements in a more ‘true to life’ analogue format. Or the clean and accurate digital recording may be more useful. Digital recordings are also much more easily edited, allowing for a greater degree of image enhancement.
For the purposes of surveillance, digital recordings are much more usable. The ability to easily store many recordings, as well as their transferability between computers makes them much more suited for current security standards.