Is kung fu or ninjutsu better for me?

I want to start a martial art. I am a girl (13) but I am pretty strong and very flexible; I can do splits and lots of gymnastic moves. I am looking for a martial art that has emphasis on high kicks and flexibility as well as strength and preferably some weapons though not necessarily. I am looking for something that has circular motions, maybe pressure points and lots of different heights and variety of moves. I'm not too keen on grappling. I've narrowed it down to KUNG FU or NINJUTSU and i want something that is very effective (in real life - the type of thing they would teach a spy or something) as well as good for other aspects of your life i.e. well being, focus e.t.c. can you please tell me if kung fu or ninjutsu would be better for me? x