No argument from me as we use both in our work, but for different applications. When I was speaking about holding heat I thinking more about some film/tint as some of these products actually contain metal therefore they hold heat while a solar screen does not. This is especially important when applied on the inside of a double pane gas filled window as I have actually seen some explode because of the heat buikd up between the panes. But for windows Solar Screens are designed to stop the heat before it hits the windows, plus you can still see out unlike a radaint barrier foil/foam combination.

Take Care,