I really don't rate any of the blanks available to be honest. The "firesteels" ones are not too bad but still not as good as the "light my fire" army version.
In my experience, the best
by far are the "fire flash" type sold by good old Mr. Mears
The plus is that you can buy these as a blank from them for £6 each and they'll do a discount on multiples.
I really wouldn't waste time on the other stuff to be honest.
By the way; I'm no "Ray Mears Groupie", it's simply that, out of the numerous types I've used over the years, the fireflash is far superior and I don't know where else to get them
cheers
R.B.