If these are the 2 arts you are interested in, try them both as Mikey said, or start with one until you become competent and then start the second art to compliment your training.
I don't want to go into which art is best as this is a debate that will never be satisfactorily concluded. But if you are interested in winning fights you will need a combination of skills including punching, kicking, groundwork and a complete lack of morals in order to put your opponent out of action.
Real fights are VERY VERY unpleasant and should be avoided at all costs, if your ego can take it there is nothing wrong with running away if it will keep your face in one piece or keep you alive.
Anyway, I digress. Forget about real fighting and learn the martial art that you enjoy the most and with time will come competence and awareness.