well first you have to go by your hair length. in other words if your hair is on the shorter side you dont' want a huge round brush and vice versa. finding a brush with boar bristle is best.. plastic bristle give split ends. and if you can find one that is vented that is also good for air flow and faster drying. protect your hair and make sure it is mostly air dried. with this you can hit it with the dryer nozzle and with two strokes your hair will be dry. less damage this way.
HTH
Om Tat Sat