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The size of the blade has nothing to do with how well it will shave. If a small blade and a lager sized blade are equally sharp it will take the same number of passes with either to get the job done....

Can't comment on the best blade for a heavy beard as I don't have a heavy beard. I would believe what Obie is saying though. I have a normal beard and I can tell you that if I did not shave for 24...