First and foremost let me assert that I am NOT a Taekwondo stylist. I realize it is not a complete martial art and is heavily influenced by sport concepts. That is why I practice the complete style of Kuk Sool Won.
However Kuk Sool Won incorporates many aspects of TKD and kung fu into the style. Bruce Lee was not the first to invent "JKD concepts". It was the Koreans when they developed Kuk Sool Won.
From someone who has experienced both worlds through the practice of KSW, I believe that I favor TKD over kung fu. Many of the TKD kicks are long range and allow unchallenged full power kicks. Kung fu is designed for close range kicks that are easily avoided by quick evasion. Given the same amount of time and training I would bet on the TKD fighter over a kung fu fighter.