Hi Orville,
I don't know much about the above mentioned brushes but I've had good luck with Sceptor Gold from Winsor and Newton.
I use older cheaper brushes for under painting. I'm pretty rough on my brushes and end up throwing a lot of them out. There are a couple that turned into nice blenders and I nick name them "my mashers". The Sceptor Golds have retained their flatness. They are a blend of sable and synthetic.
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