Thought I'd start a thread for everyone to share their thoughts on this topic.
My main jigging outfit has 80lb braid which I use mainly for kings. I attach about 3m of 100/150lb shock leader to the braid. The braid is connected to the leader using a mid knot which is a very slim knot. However, this is a pain to tie while on a rocking boat so I would revert to a spider hitch and Yucatan knot when re-tying on the go.
After losing a couple of jigs to couttas, I have been experimenting with a 6" twisted double on the leader where it connects to the jig ring. The double is twisted so that the assist hook has less chance of getting tangle with it. No bite-offs so far.
The double is tied on to a solid ring using a palomar knot. This is where the jig is attached via a split ring. The assist hook is simply looped on to the solid ring. This way, both the hook and jig can be changed independently of each other.