Tiffen has produced great filters forever; in over forty years of film wasting, I have yet to have a problem with them.
I prefer the Orange #21 as it separates skies from buildings in my cityscapes better than the #16, when I print. It’s not a workhorse like the #8 Yellow I am NEVER without, but still a useful tool for the black and white aficionado.
But Tiffen with confidence!