What is favorite and least favorite Saw film? And Why?

My favorite is Saw III because the traps are the goriest, it has the best acting, and the plot is the strongest. My least favorite, for now (it's still tentative) is Saw IV. It's really queer and uninteresting. The traps are tried, the story sags, and the film is incoherent. So, I'm intrigued to know your favorite and least favorite Saw film. If you're wondering, yes I'm a Saw fan, lol.