When selecting a wrench, my first choice would be a box end. An open end wrench would be my second choice.
Sometimes, an adjustable wrench is all that is available. There is a right and wrong way to use an adjustable wrench. The movable jaw should point in the direction the force is applied.
This picture shows the adjustable wrench with the movable jaw in the wrong position. It takes less force to damage the wrench or slip on the fastener.