I own two inexpensive shaving brushes: the Van Der Hagen (VDH), with boar bristles, and a Tweezerman-branded, inexpensive, badger brush. As I have written previously, I really like the VDH brush, with its thick, soft knot. Yet there is a difference between the two beyond type of bristle: the VDH knot of bristles is a little longer, of larger diameter, and flatter than the Tweezerman. As I pondered these differences during my morning shave yesterday, I noticed that the VDH brush is just a little too big to be precise; with it I get a bit more lather on my ears and nose.
Is this a big problem? No, but it's worth thinking about the next time you make a shaving-brush purchase. Bigger isn't necessarily better. A smallish brush is not only adequate, but may actually be preferable -- allowing a smaller soap mug/bowl and more precision in applying the lather to one's face.