Takes some skill to use a vernier! So can't say, will depend on your skill level!
By micrometer caliper You meen dial type caliper!
A micrometer and a caliper are apples and oranges
The caliper measures thicknesses and internal or external diameters inaccessible to a scale, consisting usually of a pair of adjustable pivoted legs.Another possibility would be an automotive brake...
The micrometer is more accurate because it can measure upto a millionth of a meter. Its least count is 1mm/100. Hence it can give more accurate readings compared to a vernier caliper.