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+1 what Allan notes. Truss will allow the optics to cool faster to ambient but a tube isn't that far behind. The laminar airflow down a tube is extremely effective at cooling. Tube currents are a thing of the past with active cooling. With a tube, you will not need to clean the optics as much.
If you are using the scope in an open area, truss wins as it has a low surface cross section thus not challenged by the wind. Obviously a truss with a latex sock for contrast will experience problems with the wind.
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