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As you might imagine I am a big advocate for the SCT for planetary imaging. However, you cannot compare the 12" Newtonian with the 10" SCT. The light gathering power of the 12" will have benefits to planetary imaging over the 10" in this particular case. If you compared it to a 12" SCT then I would say the 12" SCT. The SCT has planetary viewing and imaging as its main strength.
The bottom line is though; the larger the diameter the better for planetary imaging. If your only choice is a 12' Newtonian or a 10" SCT then the Newtonian should be your first choice. If you can buy a larger SCT of the same aperture I would go with the SCT. Every thing is budget related.
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