Definitely still life.

I really like landscape, but the minimum investment of time is so large that it is anxiety-inducing to think that I might not come back with something I like. For the same reason, being able to try over and over again to make the image that I want is usually out of the question.

As for people, I'm so protective of my free time that it seems unfair to ask anyone else to give up any of theirs just so I can photograph them!