Neither of these terms matches in any way the nature of archaeological features to which they have been ascribed.
Rough Archaeology - lilia
I have already suggested on the basis of reverse engineering that these postholes can be modelled as a form of timber strongpoint or redoubt. [here] Such as structure could have a solid timber base becoming progressively hollower towards the top; entry could be by a narrow passages sloping passages.
In earlier periods supporting or corroborative evidence is not available, but written sources and illustrations are available in the Roman period, which although distinct and secondary to the archaeology, do help support the structural principles embodied in the model.
The word that is used in the text is;
When that work was finished, he distributes garrisons, and closely fortifies redoubts, in order that he may the more easily intercept them, if they should attempt to cross over against his will.
….on either side of that hill he drew a cross trench of about four hundred paces, and at the extremities of that trench built forts, and placed there his military engines…
The circuit of that fortification, which was commenced by the Romans, comprised eleven miles. The camp was pitched in a strong position, and twenty-three redoubts were raised in it, in which sentinels were placed by day, lest any sally should be made suddenly; and by night the same were occupied by watches and strong guards.
But Marcus Antonius, and Caius Trebonius, the lieutenants, to whom the defense of these parts had been allotted, draughted troops from the redoubts which were more remote, and sent them to aid our troops, in whatever direction they understood that they were hard pressed.
Sometimes also attacks were made on our little forts by sallies at night. For this reason Caninius deferred drawing his works round the whole town, lest he should be unable to protect them when completed, or by disposing his garrisons in several places, should make them too weak.
Further linguistic pitfalls
The key feature of these types of structure is the use of double post pits; it might be assumed this is the simplest and quickest method of construction for soldiers working in small teams, whose principle tool was a similar to a mattock [lingo / dolabra].
I have already drawn attention to the regular layout of these features, although, notwithstanding they have been robbed, the variation in size suggests that they were also dug to suit individual pieces of timber.
In Vitruvius we find a description of how to build a Ballista; the key information is given as proportions; scale is a matter of circumstances. It has certainly been a working hypothesis that the engineering of this type of structure would be based around a measured systems or modules.
While it would be useful for understand this system, the existing sample represents a rather small disparate set of data. In addition, since most of the structure is invisible to archaeology, we cannot be sure of the significance of what can measure.
The only consistency is in having three rows; although it might perceive that the outer lines of pits should be paralleled with the inner one offset, this does not apply at Shields Road. This variation is probably not a concern, since we have a tiny sample of a very large structure built by many hands, although unlike the stone Wall, I would suggest that this was completed in one season, possibly AD 119.
Shields road is the largest sample, but only the western bit is regular the next section is very different; in the space of 11 outer pits there are 18 along the middle. I think it likely that other postholes visible on the photographs may also be part of structure.
At Buddle St, I am still uncertain if there are any double posts in this section, and this requires further work with the achieve. It is a unique situation; it is my understanding that there was already a road in existence running north from the river were presumable there was a dock, and perhaps even some form of ferry. This section was attached to a gatehouse structure, blocking the road, to the west of the road there is few metres of more conventional looking postholes.
The recently published section at Melbourne Street  is very similar to Garnhall on the Antonine Wall , in that it is formed by three parallel rows. This section is distorted; however, they appear to have dug into a stream bed which has been heavily piled in modern times.
Thus, it is appears that while these structures have been laid out with some degree of precision, the variation and sample size makes this merely an interesting observation.
You pays your money....
Sources and further reading.
 http://en.wiktionary.org/wiki/vallum [from 1913 edition of Webster’s Dictionary],