...or in this case, hitch, has much to do with the load on your webbing.
http://www.fdlake.com/rig-slng.html
This link should prove helpful. Note that it has 2 pages, and the choker hitch, which is what most people are using, is discussed on the second page.
The link doesn't address this, but at higher choke angles, some of the load is borne by the friction of the webbing/tree interface, thus reducing the load on the clip/carabiner/sewn loop.
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