I've found that one-shot-color images generally look best at somewhere between a 60 and 80 percent rescale in size whereas mono images can look good at full scale. You might consider this variation as representing the approximate difference in spacial resolution between the two different sensor types (one-shot-color versus mono, at least when the former is using something like a Bayer pattern).
Having said that, if you dither your images and then follow that up with a drizzled processing you can probably get results with a one-shot-color camera that are similar to what you'd get with a mono (in terms of resolution). However, you can dither and drizzle a mono camera too so it's kind of a never ending "race."
As OldManSky suggested, with a one-shot-color camera you sacrifice some resolution for gathering color information, while with a mono camera you sacrifice color information (during the capture of the luminance) to gather more resolution and never the twain shall meet (or said another way, you can't get something for nothing).
Similarly, you sacrifice some signal-to-noise with a one-shot-color camera versus a mono camera, particularly in luminance and when comparing similar lengths of exposure or integration time. This is why with a mono camera and when using four separate filters (luminance, red, green, blue) you can approach the results that would be captured in any given length of time with a one-shot-color camera even when the red, green, and blue channels for the mono camera receive less total exposure time than was given the one-shot-color camera. This happens because of the efficiency of the luminance from the mono camera and its greater spacial resolution.
That said, it is my opinion that given any fixed session time (say three hours) you'll never be able to exceed what could be captured with a good one-shot-color camera versus taking that same amount of time with a mono camera using separate luminance, red, green, and blue filters (in those same three hours). So, if you have a fixed amount of time you may do "better" (YMMV) with a one-shot-color camera than you would with a mono camera that has to capture separate red, green, and blue channels (at least in terms of color information, spacial resolution being a different matter). It's a complicated matter and that's why you will see some debate or differences of opinion expressed on whether color imaging is best done with a mono or one-shot-color camera.
In any case, the seeing conditions, your sampling and image scale, your capture technique, and your processing skills will generally have a greater impact on the final results than whether you are using a color or mono camera.
Edited by james7ca, 22 March 2019 - 05:53 AM.