Every kind of cutter has their respective advantages and disadvantages. I prefer 'em in this order I guess.

1.-Pierce cutter
2.-Single blade
3.-A razor blade
4.-My mouth
5.-Double bladed guillotine
6.-"V" cutter

With that being said, it's all a matter of individual preference I guess. I know folks who are just crazy about Xikars or their "v" cutters, but I insist that piercing is the way to go.