Best depends on what your objectives are.
Strongest knot for joining two ropes.
Tying three of these knots in succession will provide a permanent junction that will hold the lines together and evenly distribute the forces over the length of the seizes providing you.
But if you need to join two different materials or different sizes of rope then the sheet bend is your best bet you can use th.
Adding tension along the axis will eventually break the rope.
Then thread the tail of the thinner rope through the loop.
Take the thicker of the ropes and create a loop.
Use a double fisherman knot to join ropes of unequal diameter for multi abseil descents.
That gives you three things 1.
Do you want a knot that you will be able to untie after you have put a big load on the ropes.
If you are using two ropes as a fixed line first join them with a double fisherman knot and then tie an alpine butterfly knot that incorporates the double fisherman knot in the loop.
Then use a double fisherman s.
For joining two lines together it would be best to use a flat seizing knot.
A straight rope has a breaking strength.
The double fisherman s it a much better choice for joining two ropes.
I would agree the figure 8 is certainly the most common and very strong for equally sized ropes in identical materials.
This means that the rope is unlikely to break while you re using it.
The sheet bend is similar to the square knot it s great for joining two ropes.
Do you want an extremely secure knot won t slip or come untied.
This is one of the strongest knots you can tie and it maintains up to 85 percent of the rope s strength.
The two others add to the original configuration and expand the uses of the knot.
Bends are knots to tie two ropes together.
The first knot as the name implies is a basic figure eight knot.