Are boys better than girls at video games

Not necessarily. It is said that more boys than girls are actually playing video games, but 'the majority is not always better'. I would say no to your question.
Yes, boys are better than girls at video games. I've played against heaps of girls and always beat them.
Boys are better at technically operated things than girls because their brains are loaded this way so yes they will be better than girls at video games.