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Neither is accurate, but if you know the degree of adjustment for your wheel setup, the digital one is more precise and thus useful when precision is necessary.
The rotary one is by far easier to appreciate in peripheral vision for an approximate reading without taking your eyes off the road.
Thus the rotary one is for ordinary and track driving, the digital one for when you just passed into the radar beam or when your buddy says " how fast will this thing do xxx"
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