The advantages of the blood pressure monitor compared to a pulse monitor are the measurement of the blood pressure including the pulse value and the heart rate. Compared to the measurement via app or finger, the values on the blood pressure monitor are more reliable and complete.
A pulse monitor only measures the pulse and in some cases also the heart rate, but not the blood pressure. Devices that are placed on the wrist, ear or finger are also not suitable for determining the heart rate. A weak heart or disturbances in the veins can be reasons for this.
The advantages of a blood pressure monitor over an app are that the values are more reliable and do not have to be typed in manually. In addition to the more time-consuming use of the app, the pulse rate in particular can often be displayed incorrectly.
Constant app crashes or updates also contribute to inaccurate blood pressure measurement and are annoying. Also, basically only the pulse can be measured using fingers, and this does not allow a reliable statement about the remaining values.