I normally tell beginners to use the double surgeon to add tippet or adjust a leader section and have just for the sake of ease....and have used this knot for years. It's quick, simple, you can tie blindfolded.
I have however noticed it's not very durable and to be quite frank weak at best at least in light lines. I'm not able to tell (or atleast havent caught it happening yet) lines jumping and cutting themselves leading to the failures in light tippets.
So this year I started using the blood knot more....so far I've liked it better, it's not much harder to tie (my eyes are still good lol). I have distained this knot for awhile now just becuase it takes more time. It's easy in heavy line, the lighter lines can be a pain. Just seems to hold up better.
Till last night grayling fishing, I broke a blood knot twice. Probably was my error, as I havent had an issue one with a blood knot till last night.
your pick? and why?
Oh and btw, grayling fishing was snaztastic! Had the hole place to myself and it appeared no one had gone through it in awhile....and of course the fish were biting, thunder storm and all