Galwayguy
1. I stick to a reading of your posts that a Gallery scope versus 8x25 monocular versus 8x30/8x32 monocular comparison might be helpful to you.
2. I can compare just a Chinese 8x30 military-style porro monocular with the Helios 8x32 roof monocular.
Cosmetically the Helios resembles the probably discontinued Monk 7x30, the Kite 5x30/7x30/8x30 series, and the Opticron 5x30/8x30/8x32 series. The Helios, like I believe the Monk, Kite and Opticron models, claims high quality optics.
For me the brightness of the view through the Helios puts it into a much higher category of utility than the Chinese porro.
I suppose an 8x25 monocular can equal the brightness of the Helios, so the issue of 8x25 versus 8x30/32 monocular is availability on the market, and relative cost.
I pass on a Gallery scope.
3. To explain the importance of brightness in a monocular to me, I often use the Helios, as I used the Chinese porro, with both eyes open.
The practice is more relaxing in practical use than squinting.
But also, by viewing with both eyes open I can then use the open eye to scan while holding the view through the monocular eye on target. A blink of the viewing eye switches view between the two eyes. I am right eye and right hand dominant, so hold the monocular to the right eye with my right hand.
'Competition' of the view through the open eye with the view through the monocular eye can be reduced by maximising the brightness of the view through the monocular eye.
[The other element of reducing competition of the view through the open eye for me is ergonomic, namely holding the monocular with both hands, so 'shielding' the view through the monocular eye.]
4. I owned the Chinese porro first.
However far I shielded the view through the monocular eye, the Chinese porro failed to reduce the competition of view to a usable extent.
I was reduced to squinting.
A monocular only became useful to me with acquisition of the Helios.
5. The price of the utility of a 30/32mm objective for my manner of use is weight and bulk.
After I bought the Helios, I had to choose what small optic to take out with me between an Olympus 7x21 PC III binocular weighing 184g, and the Helios weighing 260g.
I still very often chose the Olympus.
But the present topic is monocular versus monocular; not monocular versus binocular!
Stephen