The 12 inch should give more detail in both cases, Smaller secondary, plus larger mirror should win over ( assuming mirror quality average here).
10 inch scope more compact and maneuverable,
For planetary and visual, id go the 12 inch, if I was doing deep sky, it's going to depend on the tube and focuser of the newt..... But thats not a consideration here.
For planetary just bolt on a powermate, and for visual varying eyepieces will give all you need.
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