I generally prefer the double-blade guillotine. I remember being
a little nervous the first time I used this method, thinking I would
screw it up and unravel the whole head. But it was a breeze -
even with the cheapie Savoy cutter I used. A friend of mine who
I've smoked with a bit uses a bullet cutter. I used it a few
times; it works great and all, but I just like a little bigger of a cut
I can get with the double-blade.