I'm less clear on which is superior, herringbone struts or noggins, and
why - in these days of mitre saws, cutting solid noggins to an exact
fit is no hassle.

Herringbone is superior in every respect:

1. Lighter (less dead load)
2. Cheaper (less wood)
3. Easier to install (less cutting, less precision required)
4. Easier to run cables/pipework.
5. Less susceptible to expansion/contraction.

Christian.