Spool Motor Mounts - Poly or Rubber?

Need to swap out my spool motor mounts. What are the differences between poly and rubber?

I have poly spool mounts on my bb duster. They work fine for Me. Headers fit so tight I couldn't see using the rubber mounts.

watch what brand mfg poly you might decide to buy, as some have been known to melt with high under hood heat, not a job you want to do twice...

FYI I run the Schumacher Magnum poly-loc motor mounts