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ive seen both 10" GSO and the 10" SW, the difference is only in the build quiality. GSO uses slighty thinner tube sheet metal and the SW has re inforcements in critical places.
The difference between the glass isn't that one cools faster than the other, its that pyrex doesn't expand like normal glass hence doesn't suffer from thermal changes even close to what normal glass does. In saying that unless your going to max out the capabilitys of your scope you will not see the difference.
the GSO 10:1 is good when viewing planets at high magnification but if you want to put a camera up onto the GSO 10:1 forget it... you will have major difficulties as the focus point for the GSO is hidden in the tube (either means you have to shorten the tube, put long collmination screws (not so good) and the expendature of a new really low profile focuser!)
so. this is how i see it
if you might take the astrophotography route get the SW its just better all over for taking photos.
if not get the GSO as its not as critical with the different components.
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