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Never really analyzed it. Good question. That's just the way it seems to work for me. If I had to come up with a guess I would say the 28mm is softer and creating the lather from cream doesn't...

I found the 24mm is better with soaps and the 28mm works best with creams.

Mine are Stephen's Woodworking Brushes purchased from SRD. One is 24mm and the other is 28mm, both Silvertip Badger. Absolutely love them.