Both I would say (i.e. totally redundant system).
On the plus side having two lines makes the change over to descent much quicker and safer as you just pull up the slack through the Grigri., then disengage the mini traxion.
I use both systems but on steeper ground prefer the single line, single device approach.
Also a consideration is what you mentioned, length of route versus length of rope. It may be that your only choice is single strand or bringing two ropes to the crag. |