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I don't have an SCT, but I would opt for both. If you can, use a dew strap of some sort, and fit the dew shield over the top of that.
If you are scrooge like me you will try some of that thin (maybe 5mm thick) insulated foam that campers evidently sleep/lie on (too thin for this old coot), and cut it to fit as a wrap around for the end of the tube. This insulation will keep the heat from the dew strap in, instead of radiating out into the ambient air.
I made my own nichrome wire dew straps a while ago when I had the Maksutovs, but a commercial dew strap is as good or better.
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