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I gather you are talking OSC for both cameras. If this is the case the final decision is yours to make. The two cameras should do a pretty good job on these scopes. The QHY9 will be better suited to the ED80 while the QHY8 will be better suited to the C8 and ED120. That said the two CCDs are quite diferent. The 8 has a Sony CCD which is takes images with very little noise allowing you to use without darks for much of the time while the 9 will require darks all the time.
The 8 relies on the front filter to seal the CCD chamber while the 9 has a sealed CCD chamber.
The CCD is larger in the 8 than the 9 giving a wider field of view than the 9.
Cooling on the 8 is constantly on at full power while the 9 has a computer controlled setpoint system for cooling.
It's up to you and I can understand your dilema.
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