Bottom line is that light double wall tent requires way less effort and practice to keep you and your stuff dry, both from your own condensation and from any weather.
That has not been my experience over the past 20+ years in Colorado during the bow season. But then again, it all depends on the single-walled tent. Some are well-ventilated, some are not.
The SL-5 that I use allows you to pitch it with 6-8 inches of space between the ground and the bottom of the tent walls, and it has mesh vents at the top. That allows enough air circulation that condensation is really not an issue. But a tipi style tent with the walls pitched tight to the ground and no vents does create condensation.
And I've never gotten my stuff in the tent wet in rain or snow.
