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Rather simple.
Pros of Refractor:
* crisper images due to lack of central obstruction (particularly ED / APO)
* allows lower magnification at same aperture for wide fields because f/ratio is usually lower (particularly ED / APO)
* no collimation duty which is even more difficult than a Newton / Dobson
Pros of SCT:
* More aperture for money
* More aperture for weight
* No color errors (CA) (while an APO also has negligible CA).
Make your choice.
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