There have been a lot of threads talking about the different impacts of a single line verses webbing verses wider webbing, so I really don't think that needs to be re-hashed here.
However, in all of the discussions it seems like we focus on the forces of tension applied with the hammock line on the tree. In addition, there has to be a big constrictive effect that is being applied to the tree and hence to the bark and underlying layers.
So, the question for all of tree experts, from a constrictive force view, is there a big difference to the impact on the tree in the way the line is attached to the tree? This crude chart shows some connection methods (certainly not exhaustive) to be considered in our conversation.