Well, the only one's I've practiced are Aikido and Shorinji Kempo, going on for seven years in total, but I'd still have to say that discussion of this is meaningless...
Krav Maga has been mentioned; it is good for war, not self defence. Krav Maga instills an attitude to fighting which is incompatible with civilian self defence. If you are well enough trained in Krav Maga to use it in an unanticipated fight then you will seriously injure somebody. If you do this in the streets or at a bar or club you are a criminal. That's not good for self defence...
Brazilian Ju-Jitsu has been mentioned; it is good when you don't have to worry about being beaten to death by somebody's mates. BJJ presumes and plans for every hand to hand fight going to the ground. If you are grappling somebody on the ground you are unable to avoid additional assailants effectively. That's not good for self defence...
Systema has been mentioned; it is not a martial art any more than Kung Fu or Silat is a martial art. 'The Russian System' is a label applied to a set of diverse combat martial arts and non-combat awareness and tactical systems. Kadochnikov's System, which appears to be what the video with the russian instructor and the marines is showing (though it could be Ryabko's System or even R.O.S.S, we don't see enough to tell), is often claimed to be very effective, but it's another combat focused art. In a real fight you will probably hurt people. It's less brutal than Krav Maga, apparently, but that doesn't make much difference in an unexpected fight...
So far, nobody has mentioned Parkour; it's probably the very core of option three on the poll. David Belle put together the basics of Parkour with the emphasis on total efficiency. The slightly ludicrous scenes in the newest James Bond movies are not Parkour, they are freerunning. Parkour doesn't look pretty, in fact it often looks rather ugly, but it is intended to be the trained technique of getting as far away from something as fast as possible. You want self defence? Being several hundred metres away and the other side of a 10' wall would be a pretty damn effective defence, but you need to be able to start moving away from your assailant. In an unexpected fight you've still got to find or create the opening to run. That's not good for self defence...
If you want to defend yourself you must seek to put yourself into a position in which you are not going to be attacked. Most martial arts are very clear about that point. Some of them do it by breaking the other person, some do it by disabling them, some do it by immobilising them, some do it by resisting them and some do it by avoiding them. But any martial art that is actually used by a civilian in a real fight is a martial art that is insufficient for self defence, because nobody can successfully defend themselves against their fellow men forever.
Look at the totalitarian regimes of Africa, whole villages are macheted to death in the night, children are forced to rape and kill their parents and siblings and there's simply nothing they can do about it, no matter how well trained they might be in their martial art of choice.
In my book, the best form of self defence is living in a First World country and paying your taxes. Taxes provide police presence. Police presence is a disincentive to crime across the majority of the social spectrum. Making less people willing to commit crimes is far more efficient self defence than any sort of training. Sure, you might still be attacked by an unexpected assailant, and then a martial art might help you finish the fight with less damage than the other guy, but you've done a lot more to make yourself safe by paying your taxes than you have by practicing a martial art for seven years.