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If Nikon mirrorless then the Z6 is the better over the Z7.
D750 has a good reputation. D780 is new so not sure if they are monkeying with RAWs or not. Some Nikon models do much like Sony's star eater. Fuji also does some star eater filtering as in XT2,3 and their GFX 50R.
Canon may be a tad noisier but if you are stacking that goes away. No RAW filtering in Canon's yet.
Nikon uses Sony sensors most often so they are often higher sensitivity but poorer Ha response. Nikon noise grain is much nicer than Sony's wormy noise and colour speckle in shadows.
Some Sony models can have a bit of amp glow in the corner. Nikon LENR (long exposure noise reduction) does not work well.
Greg.
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