I have Canon 1200D and now I am more interested towards astrophotography. I am confused between which one to go for. Canon 70D or Canon 760D.
Lens I hold: 18-55mm, 50mm 1.8 STM, 55-250mm IS II
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Just as the critical measure for most astronomical telescopes is how much light they can collect from each distant point source, the critical measure for a camera used in astrophotography is how much light from each distant point source they can collect. Just as telescopes with larger diameter objectives collect more light that those with smaller diameter objectives, larger imaging sensors collect more light from the same field of view than smaller imaging sensors do.
Both the 70D and the 760D have the same size sensor, so neither has an advantage there. I guess if both perform equally for the intended purpose then one might argue that the lower priced option is "better", but in terms of the results they would only be equal.