Spent few nights looking at mars with 5inch refractor and 8inch SCT
also with aid of 5x powermate televue barlow.
The 5inch gave clearest views - and while mars small (even at closest approach) - could see that surface was mottled red with black blotches... sadly no canals.
The 5 inch does not require collimation so setup easy, but no tracking (skywatcher - there is a rq drive in canada - but they only sell to canadian credit card addresses... doh)
My 8inch generally needs collimation to get best performance, and so while this has 40% more light, its yet to provide better results that 5inch.
so bigger not allways better (guess 8inch better for dso)
Discuss the nature of the Universe and the things in it.
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