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A bit off topic from visual differences..... seems to me the importance of thermal issues are totally different and incomparable to whilst imaging. My 10" (tube) RC has 3 temp sensors and full PID fan control. It gets to less than 1 deg delta between ambient/primary within 20-30mins and the fans then go from full to coasting the rest of the night.
There are so many constantly changing variables in imaging say over a 6 hr period with dozens of subs. eg guiding, seeing, focus, that the thermal current effects of a degree or 2 diff on the primary to ambient is a relatively minor problem compared to all the other factors.
Optical differences aside (ie not counting the tighter images just due to the optics), my 12" non-fanned SCT produced similar results over long imaging runs, albiet with focusing more often due to temp changes.
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