Personally I prefer a long (3/4 inch roughly) skinny roach for 2 reasons -
(1) a long slim roach cools down the smoke more than a short fat one so your less likely to get a harsh toke or burn your lips! (google "ideal gas law" for why this is).
(2) some clumsy shits pinch in the middle of the joint, now usually it doesn't affect the smoke but by giving these twats something to hold on to, the joint remains aesthetically pleasing tip the end
Disadvantages - not really suitable if your building a fatty and wider roaches will give you a 'thicker' toke
What do you guys think? Also what do you use if you don't have a roach book? (i quite like train cards!)

