It depends on the blush formula. For highly pigmented blushes, I like a fan brush or something like+
If I could only have one brush, it's this type (old MAC 217 dupe)+++
Check out Hakuhodo
I want this new Hakuhodo set.
It depends on your price range. The type of hair and length will have a large impact. ++
I just looked at BL, it doesn't name a manufacturer. I'm guessing Chikuhodo or Hakuhodo? ++
Important 411 re Hakuhodo Brushes
Hakuhodo!
Hakuhodo has amazing natural hair brushes for reasonable prices r/o
Hakuhodo is my favorite with WG and Sonia G sprinkled in.