I am choosy with my climbing partners. They are all bright, experienced and able to tell if my knot is tied correctly
, or if they aren't familiar with the double bowline they are conscientious enough to ask about it, which serves the purpose of making me triple check it..
Ward, if you want hard to untie, you should use the figure 8, hangman's noose finish, topped off with sixteen square knots.
The figure 8 has some potential problems, if used without the proper backup knot according to what I have read. It can roll if you are clipped into the loop and are using the Yosemite finish.
You people are way too worried about knot style when consistent double checking of everything is the most important aspect of climbing safety. I learned that right off the bat from my mentors and that is emphasized when I do stuff by myself way out in the woods. You have to double check everything methodically so something simple doesn't leave you stranded on the side of the cliff with no help.