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Others may have varying opinions but I feel your worrying to much about a few of the less important aspects of the systems you describe. Yes it is important to match the sensor to get a sensible pixel scale. However you say nothing about optical design, image circle size, correctors, criticality of collimation, sky brightness (country vs suburb), quality of the mount needed for the different tube lengths and weights. All these things make a massive difference, more than being simply slightly over or undersampled.
For example you could be talking about a 10" F8 RC vs a 10" F4 newtonian. Totally different in almost every respect, different focal length, different corrections needed etc....
Your right to do at least some research on the pixel scale as this should be within sensible bounderies.
Dave
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