Which in your personal opinion is better? I've been looking around of threads on this topic but haven't seen too many. I know it's personal preference but which gives the better hit? Better diffusion? How many slits on a circ would equal an arm on a tree or vice versa? I'm planning on grabbing one of the new us tubes and I'm stuck between a circ perc and a 12 or 16 arm tree. Edit: Here are the two tubes I was considering, notice how they've started to put verticle slits on their tree perc. First a side by side then a close up of the percs itself.