Which martial art should i choose?

with the small amount of info id recommend kung fu- only because it touches so many points. It supplements any other combat art nicely. I commend you to learn as much as you can grasp from every art, as in a street fight the opponent could have any type of background... in my mind- the more I know how to do, the more I know how to defend. tai chi is also a quality choice, the two I mention are more of a strong foundation- it is essential to have some modern techniques like boxing, muay thai, some kind of full speed interaction.