Hi mate, I started using braid this year and it hasnt been without its difficulties, a lot of trial and error and expensive mistakes!
I use the uniknot for just about everything but I tell you what it just does not work with braid for some reason - never use it.
I have learned a knot just for my braid called the "J knot" - so far, no failures. The leader knot is alright aswell but if your tieing your shock leader on the J-knot seems to be more compact for flying through the rings