Digital readouts are the best choice when you need to know an exact value. Like the radio frequency display, since 89.7 is a different station from 89.9.
The downside of digital readouts is that they take mental processing to actively look, read and interpret. You can't notice in peripheral vision if 89.9 suddenly changed to 89.7 (ok bad example since you'd hear the radio progam change, but assuming we're talking about visual display only here).
Rate of change and peripheral vision of approximate values is where analog gauges shine. I don't care to know if speed is 36 or 37, it's more valuable to know the approximate spot where the needle is without ever having to look at it directly. Same for tachometer, there I care about rate of change and will definitely never look at it directly since as I approach redline my eyes are far ahead on the road.
The downside of digital readouts is that they take mental processing to actively look, read and interpret. You can't notice in peripheral vision if 89.9 suddenly changed to 89.7 (ok bad example since you'd hear the radio progam change, but assuming we're talking about visual display only here).
Rate of change and peripheral vision of approximate values is where analog gauges shine. I don't care to know if speed is 36 or 37, it's more valuable to know the approximate spot where the needle is without ever having to look at it directly. Same for tachometer, there I care about rate of change and will definitely never look at it directly since as I approach redline my eyes are far ahead on the road.