Whats the best MAC blending brush for eyeshadow if your using like three colors or more?

should i use a small brush or a big one if im doing multiple colors?Whats the best MAC blending brush for eyeshadow if your using like three colors or more?
Small- flat with the wider tip. It's called the shadowing brush. It has very stiff bristles which make it easier to control the power- wet or dry. The soft one can be used for ';natural'; looks but you don't have as much control.