Hi, if your only goal is self defence krav maga would be the best option. If you are interested also in harmony, self discipline, meditation and self development I would recommend aikido.
Aikido has a reputation of very soft, pacifistic martial art, but in fact there are some styles and schools that are very martial and effective, namely Iwama aikido or Yoshinkan aikido. Tokyo riot police is trained in Yoshinkan aikido. Lenny Sly has a channel on youtube called the rogue warriors where he teaches very combat orienteted aikido as well (Steven Seagal school).
So if you decide to do aikido, make sure it is not this kind of soft, dancy, new agy style, but something real :-)
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