By Which MARTIAL ART we can both build our body and learn good karate Skills?

Karate is the best martial art to learn good karate skills. You have to specify the expression "build our body". Your question is funny. It is like "which is the best skilled labour that can both learn carpentry as well as blacksmith. Build body is to make it heavy and handsome more than the strength or power. Karate skills would make your body more flexible and sensitive and weightless. But, while practising karate, you can also attend gymnasium to build your body to your liking.