I think it's ridiculous to say men are better drivers than women or women better than men. There are so many factors and variables coming into play at any one time that no one can make broad sweeping statements about the opposite 50% of the motoring public. In fact, it's quite foolish to do so. Each driver has their own temperament, skill and experience level, personal problems etc. etc. The truth is that many men are better drivers than many women, and many women are better drivers than many men.
That being said, there is one point I would like to make in favour of men being better general drivers than women. No machine can be effectively and properly operated unless the operator fully understands the workings and technicalities of the machine they are operating. I know there are many men who don't understand what happens when they depress the clutch pedal, but there are even fewer women. In fact, the percentage of women who understand what is happening in the engine, clutch or gearbox when they change gear must be very small indeed. It's a common trait for women to ride the clutch and very few would understand the problem with doing so. Despite protestations of sexual equality and women can do the same as men, I have yet to see a woman changing her own brakes or even looking under the bonnet. There's far more to driving than just pressing that pedal, pushing that lever and turning that wheel. If women don't understand the machine then - along with the men who don't understand either - they can't drive (or operate the machine) as well as someone who does fully understand it.
That's my only general comment. When it comes to carelessness and aggression on the road and the will to break the law, men and women are equal.