I would have to say a pipe or joint, just because to me they are the easiest. If for some reason I am low on weed I will use a lung, and if I have a few friends over I will use the volcano with a huge bag attached.
Zong. I have a large bong and thought I was smoking with the big boys until my roommate purchased a large zong. Unfortunately I'm on a weed diet now though because I built a tolerance to anything except the zong.