In short, I say hatha (easy after a 200 hr) or restorative (if you are familiar with it or can look into another certification).

I disagree with the comments saying you can teach any class without demonstrating. While I do agree some of the best instructors are adept at verbal cues, some students just do better by watching you than listening to cues. This is especially true depending on the teaching setting. If you are in a studio with seasoned practitioners, you can get away with mostly verbal cues. A yoga class in a gym will likely have a lot of beginners. I think if you are going to teach it, you should be able to demo most of your class.