Question

Speed or velocity are more helpful to a pilot why

Answer 1

Speed would help the pilot know in what the rate he is going, making him able to navigate and move the plane or operate it

velocity ; helps pilot know their speed in the way they are going

can't drive a plane or etc without these ! (:

Answer 2

I don't know if I fully understood your question, but I understood it as: which of the two—speed or velocity—are more helpful to a pilot?

Speed is just distance over time. It shows how far the pilot can go in a given amount of time. Velocity is almost the same, except it gives the direction in which the pilot is moving.

Because velocity gives more information than speed, velocity would be more helpful to a pilot.