This chart gives a thorough guide to Pellon interfacing.
https://www.joann.com/on/demandware..../0565874P6.pdf
I'll be watching this thread to see what others say. I have only used a lightweight, sewable, fusible. I have a pattern that I am considering backing with a thin cloth to do a turned applique so as to not have any thready edges. Thinking about it, I wonder if there is interfacing that is fusible only on the side that touches the applique fabric? Curious minds need to know!