Which is better, Wing Chun or Tai Chi?

Two different martial arts can not be compared because they are collectively known as: martial arts, martial arts is in the personal training, for example: Tai Chi is great, then the practice of Tai Chi people do not practice properly, but on the contrary Wing Chun practitioners are practicing hard, then it is Wing Chun is great so I personally believe that the martial arts is in the personal training rather than which one of them is great