It seems that Badger Tenkara may be going out of business but, that dos not take anything away from the Tenkara contributions they have to the T-community, so here is their take on the different styles of T-lines available for T-anglers to use with their various pluses and minuses explained.
And here is TenkaraTalk’s take on things to consider in choosing what types and lengths of line to fish in Tenkara Fly Fishing: How to Choose a Tenkara Line | Tenkara Talk