This is a really tough one. To be honest I really like them all, but in the end it becomes a battle between The Stress, Koi no Telephone GOAL and Datte Ikete.. but I think Koi no Telephone GOAL wins after all. Feels most "H!P" and most "Nacchi". In a battle between cuteness and coolness, I just must vote cuteness xD + the single V cover of Koi no Telephone GOAL looks just soo good!
Ok, I admit, short hair can rock too xD
Must mention that I like the sweet version of sweetholic too, when she just lies on that bed and looks cute