Yes I did say any comparisons I do are on screen, not measured. Accuracy would be defined by measured values for which I don't need to do. I don't believe any of these profile editors are made for accurate colour repro from scene rendering anyway, rather targeting a closer precision for output.
Reliability comes from the simple notions of varying light and reproductions of the colour I see of thins like make up the all important key for what I do.
Problem is with Canon raw images the reds are way out of reality compared to what your eye sees. With the Beta1+2 shipping calibrations in LightRoom there was a huge improvement in all areas including the reds. The advantage of the DNG editor or Passport is the ability to customise your camera and light to bring the output closer to your expectations.
While I found the DNG edits to perform very well for that condition, I find the calibration/profile to not work as well in varying light, which perhaps is the same in Passport, but as I said, you simply and easily shoot a card for each set up and it's pretty much an automatic and the new profile makes the set up reliable. Now you could do so in DNG editor for each and every set up and why wouldn't the results be as good?
Hope this shows a little into where I see making a workflow more reliable, which is closer to what I said in that both will get you there , which you use is up to you.
PS. I didn't work on the beta/alpha of this chart, I did have some knowledge of it's existence, and it's works, but I'm not at all an expert in the math, numbers etc .
I am pretty sure that Adobe and X-Rite worked on this together, hence my assumption that the underpinnings lead to a similar result or goal inside the frameworks.
I just looked at the two images above. Mind you the profiles were stripped out> but if I tag them as sRGB, I see the same type of stuff between PassPort, DNG, Beta1+2 profiles etc.
The PAssport has better blue green, cyans, The DNG edit profile closer reds pinks and orange showing a more true (less saturated) colours closer to my PassPort chart which is different of course to my other charts....