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I've been shooting both OSC and mono for a number of years and the resolution difference isn't that great. Due to debayering and interpolation you do potentially lose some resolution but it isn't 4x; far closer to 2.4x.
Where a mono camera can effectively image down to about 1.6-1.7 pixels but that's only if you're shooting with shorter focal lengths. As you're thinking of pairing it with a 1000mm telescope:
At what is generally seeing on the better side of average... 2 arcsec ... an ASI1600 will have stars at 2.5 pixels. The ASI071 has larger pixels so under the same seeing it'll cover 2 pixels but after debayering and interpolation it'll resolve closer to 2.36 arcseconds or about average seeing.
Now you can do CFA drizzle integration which does help mitigate this to some extent but my experience has been that it helps with colour rendition more so than getting closer to 2 pixels rather than the 2.4 pixels.
Where mono trounces OSC is with narrowband imaging.
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