I'm going to be using a commercial inkjet printer from a pro lab. Image shot in AdobeRGB and printed in AdobeRGB, sRGB printed in sRGB. This is demonstrating how bad my workflow is? Are you expecting that the average person will vote for the sRGB? Or maybe it'll be a tie?
Tell me in advance what is bad about the workflow I'm going to use, so I can consider it for the video.
First off, I'd shoot ONE image in raw, then convert to sRGB and Adobe RGB (1998) from the raw converter instead of two images processed in each from the camera. Why? Because it eliminates some variables. Just make the master raw 'look good' then convert without trying to adjust to the two RGB working spaces based on any soft proof. If you must capture without raw, it should be something that is a still life where the two are absolutely identical expect for the camera color settings.
Next keep in mind when you say
AdobeRGB printed in AdobeRGB, sRGB printed in sRGB that makes no sense. Again, there is no such thing as a printer that produces either. Both color spaces will be converted
to an output color space. Got a good printer profile? That be darn useful. I'd be very happy to build an excellent quality custom profile for whatever printer you use. Ain't going to happen by tomorrow. If you do build or supply an output profile, we can plot the gamut of the printer. We can also plot the gamut of the two images on top of it. That would be quite useful IF your goal is to really understand what is and isn't out of gamut.
Image content is important. I've illustrated this in my video which has been referenced. It would be very easy to stack the decks in favor of either working space based on image content. Keep in mind Gary that the scene itself has a gamut and while the camera, illuminant and other factors can be static, if you capture a monochromic scene versus one with vivid colors (blue sky was an example), the results can vary tremendously.
The paper surface could play a role, and of course, the way in which the prints are illuminated and viewed by the people voting. You'd be better off getting a group of volunteers of male and female and of different age groups.
I'm sure I'm forgetting a few other items, but if you conducted your tests using all of the above, I know I'd have far less reason to dismiss the results!