Most of the above-mentioned knots will work.
The trick is for you to find a join that you are confident with, can reproduce consistently time and time again, and (for the R/Surfers) be able to reproduce consistently on a beach in a wind, and perhaps in the dark.
For me, my backing knot of choice is the 2 Bimini's joined by the CatsPaw. Can reproduce these consistently and without error in my time of need!