what knot is best?

[RadSav]

Butterfly knot-I prefer over truckers hitch as it won't bind up under high tension. sometimes a bowline on bite if its going to be extreme tension (like pulling a car out of ditch with mechanical advantage.
 

Never used that knot much.  I might have to give it a little more attention.

[Max the dog]

Butterfly is a great knot and easy to tie.  It does take a bit more slack line to tie.