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The TOA is a completely different objective design to the TSA - it has two ED lenses in it's triplet objective, and of all refractors on the market today it has the best colour correction.
If you are using the scope for visual though, I doubt you would be able to tell the difference. The 10mm extra aperture will make a slight difference, the extra weight would definately make a difference.
I have a 5" apo and a C11. I prefer the C11 for visual astronomy.
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