I use a double blade guillotine cutter, however I think the most efficient and effective cutter is actually the punch cutter. Only problem is its usually such a small punch it can make the draw a bit tight. I'd love to find around a 38 RG punch cutter. Only problem is you cant use on figurado's, however I think parajo's account for roughly 95% of the cigars.
Punch cutters are very effortless, perfect cut every time, doesn't snip the filler.