Of course my favourite completed game at the moment is The Law. It feels like the best possible evolution and convergence of the systems I've been developing and publishing for years. A few of my other games will always have a special place in my heart, and in the future I might create another game that becomes my new favourite.
My favourite uncompleted game would be my Walkabout project. But it demands a degree of attention that I just can't afford to give it at the moment.
Sometimes I wish that I had worked on one of those big tentpole games that everyone knows, but just because I'm a white male designer it doesn't mean I automatically get in on those prestigious titles. Being on the opposite side of the world to those conventions where everyone gets to meet each other face to face doesn't help.