Thanks Vandit... That's some quality info there
Spent quite some time thinking about this knot last night. Basically the ideal knot should require a progressive clamping down on the mainline by the tag end components so that the load is not borne at the first point of turn in the mainline. If this can be achieved by progressive slippage of the knots, so much the better. The FG is a great example of this (except that it's a line to line connection rather than a terminal, but the principle applies). The chain knot obviously requires very tightly tied half-hitches all the way up the mainline in order to perform well since the tag end components tightness will not increase as the tension on the line increases.
I can see my next few evenings spent in my own personal little Knot Wars.