Interesting poll. I had expected OTT to be more popular as most cattys seemto be that style, but i'm shooting better with TTF and getting far less fork hits (yeh coz i've got 'L' plates). So for now i'll stick with TTF.
I started out shooting OTT with my Scout, then was compelled to switch to TTF when I got my HTS. I am much more accurate shooting TTF, but will switch back to OTT for the fun factor. I have been able to shoot both right- and left-handed (have to do that because of arthritic elbows) and I find that I prefer shooting TTF when shooting left-handed, and OTT when shooting right-handed. Odd.
I am trying both right now. Just learning. I kind of wanted to shoot otf thinking that if I build a slingshot from one of the local trees, it might be easier. But at the moment ttf seems to be getting closer to the bulls eye.