Does anyone know what are the best coniferous trees to obtain the root cordage from? Or will they all provide half decent cordage?
to be honest it all depends on how you intend to use it.
If you want to sew bark containers or Canoes
together with either smaller whole roots or split down larger ones then sitka's very good.
I have also used; Fir, Western Red Cedar, Western Hemlock and scot's pine. They are all similar in my experience but I find the Sitka easiest to collect as there are sizable areas scattered throughout the area I have access to.
If you are looking to actually make twisted cordage or rope then I would go for bark in the form of either Wych elm or Lime.
You can also use alder roots, I think these turn black or dark brown but I may be mistaken on this.
Hope this helps
R.B.