Applejacks style is honest and true, and modest due to the hair tie.
Better than rainbows, to be honest.
Although rainbow does have a ruffian style.
Twilight has quite a formal and regal look, and not to mention, that's quite appealing.
Fluttershys hair looks like the common girl, and rarity looks overdone, like she spent too much time curling her hair and it went to hell.