I used to think the bigger blades were better for a heavy or stiff beard, now I think the grind has more to do with how well a blade handles stiff wiskers than the width of the blade.

Having said that; my favorite three razors are a 4/8, a 6/8, and a 13/16...enjoy them all.

Dave

P.S. Just make sure you get your first razor honed by someone who knows how to do it! I know you have heard it before, but it really is that important.