I own badger, boar, horsehair, and synthetic brushes. They can all get the job done.
If you like using traditional soaps with hard pucks, you might prefer a boar brush. These have stiff bristles and a flat top that works well with harder soaps. If you use your puck in a shaving mug, you can find boar brushes with longer handles. Boar brushes tend to be uncomfortable when new, but can be amazingly soft after they break in.
Badger brushes come in a variety of knot diameters, canopy shapes, and hair types. Some people like brushes with some scrub or scritch to exfoliate their skin. They might choose a black badger, or pure badger, which are lower grades of badger hair. Because I have sensitive skin, I tend to prefer softer hairs found in best badger, finest badger, and silvertip badger. Sometimes you will find "gel knots" that have been bleached to damage the hair and make it softer. The hairs of such brushes will clump together or "gel" when wet. Using this method, a best badger knot might be just as soft as a premium silvertip knot.
Some people like small diameter knots of 18-22 mm. Many people, including me, prefer knots of 24-26mm diameter. Some like even larger diameter brushes. The larger the knot diameter and the higher grade the badger hair, the more expensive the brush.
The canopy of brushes can range from flat to fan shaped to bulb shaped. Those who face lather often prefer fan shaped knots. I like to build my lather in a bowl and apply the lather to my face using the side of the brush; I prefer bulb shaped knots.
Horse hair brushes are not as readily available as they one were as one of the primary manufacturers Vie Long has stopped producing them. They are somewhere between boar and badger in stiffness and softness. As horse hair is similar to human hair, these knots are subject to tangles and require some maintenance.
Synthetic fiber brushes can range the gamut from scritchy to scrubby to soft. Many are inexpensive like boar knots. However, some premium brushes can be more expensive.
As you can see, there is no RIGHT brush for everyone. The only way to find out what you like is to try various brushes until you find your favorite. Hopefully, some of my guidelines will help you narrow in on your favorite quickly. Otherwise, you will end up with shelves full of brushes like many of us have.
Tedolph,
Ventastic and
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