Oh, have I missed anything since mid May? I had to stop following this thread as it is just too exciting.
Back then I commented on using wooden gauges . I have absolutely no experience of any wheeled or metal ones so I will give my tuppence worth from total ignorance. I think it time for a recap and roundup.
There has been a lot about accuracy - surely setting a wheel or a pin by eye against a rule gives exactly the same accuracy for both tools, as would setting either against some reference such as a template; but I concede that a dual pin gadget could be easier to set to a chisel width if using the technique on Veritas video) compared to holding the chisel to the pins.
Once set a wooden gauge will retain it's setting (unless worn out) and in theory a metal one should do likewise, except of course this whole thread is about a metal one slipping. I suppose that a wooden gauge has an advantage of a thumbscrew or a slotted screw either will give a greater force than a small knurled screw and tightening onto wood will be less likely to slip than on shiny metal.
Gerard - do the screws tighten directly on the rod? I have a cheap (of course, it's mine so it would be cheap) router that had a slippage problem, I dropped a piece of brass in the thread hole so that goes between the screw and rod and it worked.
A question to the wheelies - if you want to start and stop marking exactly at a line is it easy with a wheel? With a pin it is pretty obvious where you are starting and finishing.
Holding and gripping: I like the feel of a round-top wooden gauge, it seems to just want to be held, like some others I am now finding it harder to grip thin and smooth tools, especially on cold days when the arthritis is playing up, my thought when seeing the metal gauges is that I would have problems but I see that Ttrees finds gripping the metal ones fine.
So I think the original question still has not been successfully answered, but several suggestions have been made on how to stop the Veritas slipping, perhaps it is time for a working answer to be posted (again?).
On the resulting off-question discussion I do not see there being a clear winner - some prefer the metal with wheel(s), others prefer the wooden and the pins, on the way we have had red-herrings to try to justify standpoints without mentioning in any depth that we are individuals with different backgrounds, different experiences, different finances and different views on what we enjoy about woodworking and tools, they are probably more important to our standpoints than the accuracy, ease of use and feel of a tool.
I'm getting to an age when I think about the days slipping by, I can't resist throwing in my views and then think what a waste of time because they won't make a blind bit of difference.
There will always be polarised views because there are members who like to take their time and enjoy the experiences, those who are making a living from their work and use the fastest techniques, those who are interested in traditional ways, those who think anything that does not have a shine and high price tag is worthless and also those who enjoy working with wood but have to resort to using scraps of wood and work in difficult environments.