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Here are a few simple numbers that might help with a decision. I have assumed you're not using a reducer, so focal length is 550mm.
ASI1600mm: image scale 1.43 arcsec/pixel, FOV 1.84x1.39 degrees. That image scale will be quite forgiving of bad seeing and imperfect guiding and would be well sampled at around 5 arcseconds.
ASI183mm: image scale 0.9 arcsec/pixel, FOV 1.37x0.92 degrees. Image scale means you're well sampled at around 3 arcseconds, so less forgiving on seeing and guiding but not impossibly so.
The ASI1600mm system will be about 1.8x faster taking into account the QE of each camera and the pixel size/area.
Now you have to think about the size of the objects you want to image, the resolution you'd want to achieve and whether faster imaging is a priority for you.
Cheers,
Rick.
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