I agree with a previous post - if you are interested mainly in self defense, then betweem the two martial arts you named, BJJ would probably better equip you. I believe the main difference is not so much in the difference in techniques, but in philosophy. I train in taijutsu, which gave birth to jujutsu. As a combat oriented art, rather than sport there is a different mindset when performing techniques and training. I believe this to be the important difference. Good luck in your decision.
janet dtantirojanarat
www.warriorwoman.org